diff --git a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/controller/CcdiBankStatementController.java b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/controller/CcdiBankStatementController.java
index cec48f6f..f8c99b56 100644
--- a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/controller/CcdiBankStatementController.java
+++ b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/controller/CcdiBankStatementController.java
@@ -3,6 +3,7 @@ package com.ruoyi.ccdi.project.controller;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.ruoyi.ccdi.project.domain.dto.CcdiBankStatementQueryDTO;
 import com.ruoyi.ccdi.project.domain.excel.CcdiBankStatementExcel;
+import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementCounterpartyVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementDetailVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementFilterOptionsVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementListVO;
@@ -55,6 +56,19 @@ public class CcdiBankStatementController extends BaseController {
         return getDataTable(result.getRecords(), result.getTotal());
     }
 
+    /**
+     * 分页查询对手方聚合列表
+     */
+    @GetMapping("/counterparty/list")
+    @Operation(summary = "分页查询对手方聚合列表")
+    public TableDataInfo counterpartyList(CcdiBankStatementQueryDTO queryDTO) {
+        projectAccessService.assertCanRead(queryDTO.getProjectId());
+        PageDomain pageDomain = TableSupport.buildPageRequest();
+        Page<CcdiBankStatementCounterpartyVO> page = new Page<>(pageDomain.getPageNum(), pageDomain.getPageSize());
+        Page<CcdiBankStatementCounterpartyVO> result = bankStatementService.selectCounterpartyPage(page, queryDTO);
+        return getDataTable(result.getRecords(), result.getTotal());
+    }
+
     /**
      * 查询项目级筛选项
      */
diff --git a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/domain/vo/CcdiBankStatementCounterpartyVO.java b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/domain/vo/CcdiBankStatementCounterpartyVO.java
new file mode 100644
index 00000000..9a98039c
--- /dev/null
+++ b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/domain/vo/CcdiBankStatementCounterpartyVO.java
@@ -0,0 +1,44 @@
+package com.ruoyi.ccdi.project.domain.vo;
+
+import lombok.Data;
+
+import java.math.BigDecimal;
+
+/**
+ * 流水对手方聚合VO
+ *
+ * @author ruoyi
+ */
+@Data
+public class CcdiBankStatementCounterpartyVO {
+
+    /** 对方名称 */
+    private String customerAccountName;
+
+    /** 对方名称是否为空 */
+    private Boolean nameEmpty;
+
+    /** 关联账号数 */
+    private Integer accountCount;
+
+    /** 流入合计 */
+    private BigDecimal inAmount;
+
+    /** 流入笔数 */
+    private Long inCount;
+
+    /** 流出合计 */
+    private BigDecimal outAmount;
+
+    /** 流出笔数 */
+    private Long outCount;
+
+    /** 总交易金额 */
+    private BigDecimal totalAmount;
+
+    /** 总笔数 */
+    private Long totalCount;
+
+    /** 最近交易时间 */
+    private String latestTrxDate;
+}
diff --git a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/mapper/CcdiBankStatementMapper.java b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/mapper/CcdiBankStatementMapper.java
index 4a6ba154..0836a0f4 100644
--- a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/mapper/CcdiBankStatementMapper.java
+++ b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/mapper/CcdiBankStatementMapper.java
@@ -4,6 +4,7 @@ import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.ruoyi.ccdi.project.domain.entity.CcdiBankStatement;
 import com.ruoyi.ccdi.project.domain.dto.CcdiBankStatementQueryDTO;
+import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementCounterpartyVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementDetailVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementFilterOptionsVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementListVO;
@@ -38,6 +39,9 @@ public interface CcdiBankStatementMapper extends BaseMapper<CcdiBankStatement> {
     Page<CcdiBankStatementListVO> selectStatementPage(Page<CcdiBankStatementListVO> page,
                                                       @Param("query") CcdiBankStatementQueryDTO query);
 
+    Page<CcdiBankStatementCounterpartyVO> selectCounterpartyPage(Page<CcdiBankStatementCounterpartyVO> page,
+                                                                 @Param("query") CcdiBankStatementQueryDTO query);
+
     List<CcdiBankStatementListVO> selectStatementListForExport(@Param("query") CcdiBankStatementQueryDTO query);
 
     CcdiBankStatementDetailVO selectStatementDetailById(@Param("bankStatementId") Long bankStatementId);
diff --git a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/service/ICcdiBankStatementService.java b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/service/ICcdiBankStatementService.java
index 9abf6079..7fd5c1f9 100644
--- a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/service/ICcdiBankStatementService.java
+++ b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/service/ICcdiBankStatementService.java
@@ -3,6 +3,7 @@ package com.ruoyi.ccdi.project.service;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.ruoyi.ccdi.project.domain.dto.CcdiBankStatementQueryDTO;
 import com.ruoyi.ccdi.project.domain.excel.CcdiBankStatementExcel;
+import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementCounterpartyVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementDetailVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementFilterOptionsVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementListVO;
@@ -34,6 +35,16 @@ public interface ICcdiBankStatementService {
     Page<CcdiBankStatementListVO> selectStatementPage(Page<CcdiBankStatementListVO> page,
                                                       CcdiBankStatementQueryDTO queryDTO);
 
+    /**
+     * 分页查询对手方聚合列表
+     *
+     * @param page 分页对象
+     * @param queryDTO 查询条件
+     * @return 分页结果
+     */
+    Page<CcdiBankStatementCounterpartyVO> selectCounterpartyPage(Page<CcdiBankStatementCounterpartyVO> page,
+                                                                 CcdiBankStatementQueryDTO queryDTO);
+
     /**
      * 查询导出列表
      *
diff --git a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/service/impl/CcdiBankStatementServiceImpl.java b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/service/impl/CcdiBankStatementServiceImpl.java
index da644921..9fcdc720 100644
--- a/ccdi-project/src/main/java/com/ruoyi/ccdi/project/service/impl/CcdiBankStatementServiceImpl.java
+++ b/ccdi-project/src/main/java/com/ruoyi/ccdi/project/service/impl/CcdiBankStatementServiceImpl.java
@@ -3,6 +3,7 @@ package com.ruoyi.ccdi.project.service.impl;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.ruoyi.ccdi.project.domain.dto.CcdiBankStatementQueryDTO;
 import com.ruoyi.ccdi.project.domain.excel.CcdiBankStatementExcel;
+import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementCounterpartyVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementDetailVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementFilterOptionsVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementHitTagVO;
@@ -57,6 +58,16 @@ public class CcdiBankStatementServiceImpl implements ICcdiBankStatementService {
         return result;
     }
 
+    @Override
+    public Page<CcdiBankStatementCounterpartyVO> selectCounterpartyPage(
+        Page<CcdiBankStatementCounterpartyVO> page,
+        CcdiBankStatementQueryDTO queryDTO
+    ) {
+        CcdiBankStatementQueryDTO normalizedQuery = queryDTO == null ? new CcdiBankStatementQueryDTO() : queryDTO;
+        normalizeQuery(normalizedQuery);
+        return bankStatementMapper.selectCounterpartyPage(page, normalizedQuery);
+    }
+
     @Override
     public List<CcdiBankStatementExcel> selectStatementListForExport(CcdiBankStatementQueryDTO queryDTO) {
         CcdiBankStatementQueryDTO normalizedQuery = queryDTO == null ? new CcdiBankStatementQueryDTO() : queryDTO;
@@ -153,6 +164,7 @@ public class CcdiBankStatementServiceImpl implements ICcdiBankStatementService {
         queryDTO.setCounterpartyAccount(normalizeText(queryDTO.getCounterpartyAccount()));
         queryDTO.setTransactionType(normalizeText(queryDTO.getTransactionType()));
         queryDTO.setOurSubjects(normalizeList(queryDTO.getOurSubjects()));
+        queryDTO.setOurCertNos(normalizeList(queryDTO.getOurCertNos()));
         queryDTO.setOurBanks(normalizeList(queryDTO.getOurBanks()));
         queryDTO.setOurAccounts(normalizeList(queryDTO.getOurAccounts()));
         queryDTO.setCounterpartyNameEmpty(Boolean.TRUE.equals(queryDTO.getCounterpartyNameEmpty()));
@@ -180,6 +192,21 @@ public class CcdiBankStatementServiceImpl implements ICcdiBankStatementService {
         if ("trxDate".equalsIgnoreCase(normalized)) {
             return "trxDate";
         }
+        if ("latestTrxDate".equalsIgnoreCase(normalized)) {
+            return "latestTrxDate";
+        }
+        if ("inAmount".equalsIgnoreCase(normalized)) {
+            return "inAmount";
+        }
+        if ("outAmount".equalsIgnoreCase(normalized)) {
+            return "outAmount";
+        }
+        if ("totalAmount".equalsIgnoreCase(normalized)) {
+            return "totalAmount";
+        }
+        if ("totalCount".equalsIgnoreCase(normalized)) {
+            return "totalCount";
+        }
         return "trxDate";
     }
 
diff --git a/ccdi-project/src/main/resources/mapper/ccdi/project/CcdiBankStatementMapper.xml b/ccdi-project/src/main/resources/mapper/ccdi/project/CcdiBankStatementMapper.xml
index 8a210870..f4f29f56 100644
--- a/ccdi-project/src/main/resources/mapper/ccdi/project/CcdiBankStatementMapper.xml
+++ b/ccdi-project/src/main/resources/mapper/ccdi/project/CcdiBankStatementMapper.xml
@@ -72,6 +72,20 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         <result property="displayAmount" column="displayAmount"/>
     </resultMap>
 
+    <resultMap id="CcdiBankStatementCounterpartyVOResultMap"
+               type="com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementCounterpartyVO">
+        <result property="customerAccountName" column="customerAccountName"/>
+        <result property="nameEmpty" column="nameEmpty"/>
+        <result property="accountCount" column="accountCount"/>
+        <result property="inAmount" column="inAmount"/>
+        <result property="inCount" column="inCount"/>
+        <result property="outAmount" column="outAmount"/>
+        <result property="outCount" column="outCount"/>
+        <result property="totalAmount" column="totalAmount"/>
+        <result property="totalCount" column="totalCount"/>
+        <result property="latestTrxDate" column="latestTrxDate"/>
+    </resultMap>
+
     <resultMap id="CcdiBankStatementDetailVOResultMap" type="com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementDetailVO">
         <id property="bankStatementId" column="bankStatementId"/>
         <result property="projectId" column="projectId"/>
@@ -284,6 +298,45 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         </choose>
     </sql>
 
+    <sql id="counterpartyNameExpr">
+        TRIM(IFNULL(bs.CUSTOMER_ACCOUNT_NAME, ''))
+    </sql>
+
+    <sql id="counterpartyOrderBy">
+        <choose>
+            <when test="query.orderBy == 'inAmount' and query.orderDirection == 'asc'">
+                ORDER BY inAmount ASC, totalCount DESC, customerAccountName ASC
+            </when>
+            <when test="query.orderBy == 'inAmount' and query.orderDirection == 'desc'">
+                ORDER BY inAmount DESC, totalCount DESC, customerAccountName ASC
+            </when>
+            <when test="query.orderBy == 'outAmount' and query.orderDirection == 'asc'">
+                ORDER BY outAmount ASC, totalCount DESC, customerAccountName ASC
+            </when>
+            <when test="query.orderBy == 'outAmount' and query.orderDirection == 'desc'">
+                ORDER BY outAmount DESC, totalCount DESC, customerAccountName ASC
+            </when>
+            <when test="query.orderBy == 'totalCount' and query.orderDirection == 'asc'">
+                ORDER BY totalCount ASC, totalAmount DESC, customerAccountName ASC
+            </when>
+            <when test="query.orderBy == 'totalCount' and query.orderDirection == 'desc'">
+                ORDER BY totalCount DESC, totalAmount DESC, customerAccountName ASC
+            </when>
+            <when test="query.orderBy == 'latestTrxDate' and query.orderDirection == 'asc'">
+                ORDER BY latestTrxDate ASC, totalAmount DESC, customerAccountName ASC
+            </when>
+            <when test="query.orderBy == 'latestTrxDate' and query.orderDirection == 'desc'">
+                ORDER BY latestTrxDate DESC, totalAmount DESC, customerAccountName ASC
+            </when>
+            <when test="query.orderBy == 'totalAmount' and query.orderDirection == 'asc'">
+                ORDER BY totalAmount ASC, totalCount DESC, customerAccountName ASC
+            </when>
+            <otherwise>
+                ORDER BY totalAmount DESC, totalCount DESC, customerAccountName ASC
+            </otherwise>
+        </choose>
+    </sql>
+
     <select id="selectStatementPage" resultMap="CcdiBankStatementListVOResultMap">
         SELECT
         <include refid="statementListColumns"/>
@@ -294,6 +347,38 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         <include refid="statementOrderBy"/>
     </select>
 
+    <select id="selectCounterpartyPage" resultMap="CcdiBankStatementCounterpartyVOResultMap">
+        SELECT
+            grouped.customerAccountName,
+            CASE WHEN grouped.customerAccountName = '' THEN 1 ELSE 0 END AS nameEmpty,
+            grouped.accountCount,
+            grouped.inAmount,
+            grouped.inCount,
+            grouped.outAmount,
+            grouped.outCount,
+            grouped.totalAmount,
+            grouped.totalCount,
+            grouped.latestTrxDate
+        FROM (
+            SELECT
+                <include refid="counterpartyNameExpr"/> AS customerAccountName,
+                COUNT(DISTINCT NULLIF(TRIM(IFNULL(bs.CUSTOMER_ACCOUNT_NO, '')), '')) AS accountCount,
+                SUM(IFNULL(bs.AMOUNT_CR, 0)) AS inAmount,
+                SUM(CASE WHEN IFNULL(bs.AMOUNT_CR, 0) > 0 THEN 1 ELSE 0 END) AS inCount,
+                SUM(IFNULL(bs.AMOUNT_DR, 0)) AS outAmount,
+                SUM(CASE WHEN IFNULL(bs.AMOUNT_DR, 0) > 0 THEN 1 ELSE 0 END) AS outCount,
+                SUM(IFNULL(bs.AMOUNT_CR, 0) + IFNULL(bs.AMOUNT_DR, 0)) AS totalAmount,
+                COUNT(1) AS totalCount,
+                DATE_FORMAT(MAX(<include refid="parsedTrxDateExpr"/>), '%Y-%m-%d %H:%i:%s') AS latestTrxDate
+            FROM ccdi_bank_statement bs
+            <where>
+                <include refid="statementFilterWhere"/>
+            </where>
+            GROUP BY <include refid="counterpartyNameExpr"/>
+        ) grouped
+        <include refid="counterpartyOrderBy"/>
+    </select>
+
     <select id="selectStatementListForExport" resultMap="CcdiBankStatementListVOResultMap">
         SELECT
         <include refid="statementListColumns"/>
diff --git a/ccdi-project/src/test/java/com/ruoyi/ccdi/project/controller/CcdiBankStatementControllerTest.java b/ccdi-project/src/test/java/com/ruoyi/ccdi/project/controller/CcdiBankStatementControllerTest.java
index cac9b8aa..100936dd 100644
--- a/ccdi-project/src/test/java/com/ruoyi/ccdi/project/controller/CcdiBankStatementControllerTest.java
+++ b/ccdi-project/src/test/java/com/ruoyi/ccdi/project/controller/CcdiBankStatementControllerTest.java
@@ -3,6 +3,7 @@ package com.ruoyi.ccdi.project.controller;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.ruoyi.ccdi.project.domain.dto.CcdiBankStatementQueryDTO;
 import com.ruoyi.ccdi.project.domain.excel.CcdiBankStatementExcel;
+import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementCounterpartyVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementDetailVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementFilterOptionsVO;
 import com.ruoyi.ccdi.project.domain.vo.CcdiBankStatementListVO;
@@ -80,6 +81,31 @@ class CcdiBankStatementControllerTest {
         assertEquals(1, result.getRows().size());
     }
 
+    @Test
+    void counterpartyList_shouldReturnTableData() {
+        MockHttpServletRequest request = new MockHttpServletRequest();
+        request.setParameter("pageNum", "1");
+        request.setParameter("pageSize", "10");
+        RequestContextHolder.setRequestAttributes(new ServletRequestAttributes(request));
+
+        CcdiBankStatementQueryDTO queryDTO = new CcdiBankStatementQueryDTO();
+        queryDTO.setProjectId(100L);
+        CcdiBankStatementCounterpartyVO row = new CcdiBankStatementCounterpartyVO();
+        row.setCustomerAccountName("测试对手方");
+        row.setTotalCount(2L);
+        Page<CcdiBankStatementCounterpartyVO> page = new Page<>(1, 10);
+        page.setRecords(List.of(row));
+        page.setTotal(1);
+        when(bankStatementService.selectCounterpartyPage(any(), same(queryDTO))).thenReturn(page);
+
+        TableDataInfo result = controller.counterpartyList(queryDTO);
+
+        assertEquals(200, result.getCode());
+        assertEquals(1L, result.getTotal());
+        assertEquals(1, result.getRows().size());
+        verify(projectAccessService).assertCanRead(100L);
+    }
+
     @Test
     void detail_shouldReturnAjaxResultSuccess() {
         CcdiBankStatementDetailVO detailVO = new CcdiBankStatementDetailVO();
diff --git a/ccdi-project/src/test/java/com/ruoyi/ccdi/project/mapper/CcdiBankStatementMapperXmlTest.java b/ccdi-project/src/test/java/com/ruoyi/ccdi/project/mapper/CcdiBankStatementMapperXmlTest.java
index c608dcb2..e694e7d7 100644
--- a/ccdi-project/src/test/java/com/ruoyi/ccdi/project/mapper/CcdiBankStatementMapperXmlTest.java
+++ b/ccdi-project/src/test/java/com/ruoyi/ccdi/project/mapper/CcdiBankStatementMapperXmlTest.java
@@ -116,6 +116,27 @@ class CcdiBankStatementMapperXmlTest {
         assertTrue(sql.contains("END ) <= ?"), sql);
     }
 
+    @Test
+    void selectCounterpartyPage_shouldGroupByTrimmedCounterpartyNameAndReuseFilters() throws Exception {
+        MappedStatement mappedStatement = loadMappedStatement(
+                "com.ruoyi.ccdi.project.mapper.CcdiBankStatementMapper.selectCounterpartyPage");
+        CcdiBankStatementQueryDTO queryDTO = new CcdiBankStatementQueryDTO();
+        queryDTO.setProjectId(33L);
+        queryDTO.setTabType("out");
+        queryDTO.setCounterpartyName("杭州");
+        queryDTO.setOrderBy("totalAmount");
+        queryDTO.setOrderDirection("desc");
+
+        String sql = renderSql(mappedStatement, queryDTO);
+
+        assertTrue(sql.contains("TRIM(IFNULL(bs.CUSTOMER_ACCOUNT_NAME, '')) AS customerAccountName"), sql);
+        assertTrue(sql.contains("GROUP BY TRIM(IFNULL(bs.CUSTOMER_ACCOUNT_NAME, ''))"), sql);
+        assertTrue(sql.contains("(bs.project_id = ?)"), sql);
+        assertTrue(sql.contains("IFNULL(bs.AMOUNT_DR, 0) > 0"), sql);
+        assertTrue(sql.contains("bs.CUSTOMER_ACCOUNT_NAME LIKE CONCAT('%', TRIM(?), '%')"), sql);
+        assertTrue(sql.contains("ORDER BY totalAmount DESC, totalCount DESC, customerAccountName ASC"), sql);
+    }
+
     @Test
     void selectStatementDetailById_shouldJoinUploadRecordForOriginalFileMetadata() throws Exception {
         try (InputStream inputStream = getClass().getClassLoader().getResourceAsStream(RESOURCE)) {
diff --git a/docs/plans/backend/2026-07-20-bank-statement-counterparty-backend-implementation.md b/docs/plans/backend/2026-07-20-bank-statement-counterparty-backend-implementation.md
new file mode 100644
index 00000000..a3676f6e
--- /dev/null
+++ b/docs/plans/backend/2026-07-20-bank-statement-counterparty-backend-implementation.md
@@ -0,0 +1,29 @@
+# 流水明细对手方聚合查询后端实施计划
+
+## 背景
+
+明细查询需要增加类似 lsfx 对手方页签的聚合视图，按流水 `CUSTOMER_ACCOUNT_NAME` 归集同一项目、同一筛选条件下的交易数据，供前端展示对手方汇总。
+
+## 实施范围
+
+- `ccdi-project` 后端模块。
+- 新增对手方聚合分页接口，不新增业务表，不修改已有流水明细查询入参结构。
+- 复用 `CcdiBankStatementQueryDTO` 的项目、交易方向、交易时间、本方主体、本方银行、本方账号、金额区间、对方名称、对方账户、摘要和空值匹配筛选。
+
+## 实施步骤
+
+1. 新增 `CcdiBankStatementCounterpartyVO`，返回对手方名称、空值标识、关联账号数、流入/流出金额与笔数、总交易额、总笔数、最近交易时间。
+2. 在 `CcdiBankStatementController` 增加 `GET /ccdi/project/bank-statement/counterparty/list`，沿用项目读权限校验和 RuoYi 分页返回结构。
+3. 在 `ICcdiBankStatementService` 与 `CcdiBankStatementServiceImpl` 增加聚合查询服务方法，统一复用明细查询参数归一化和排序白名单。
+4. 在 `CcdiBankStatementMapper` 与 XML 中新增聚合 SQL：
+   - 对 `CUSTOMER_ACCOUNT_NAME` 做 `TRIM(IFNULL(..., ''))` 后分组。
+   - 用 `CASE WHEN AMOUNT >= 0` 统计流入，用 `< 0` 统计流出。
+   - 用 `ABS(AMOUNT)` 计算流出合计和总交易额，便于前端展示正数合计。
+   - 最近交易时间复用既有交易时间解析表达式。
+5. 补充 Controller 与 Mapper XML 单元测试，覆盖接口分页返回、SQL 聚合字段、筛选条件和排序。
+
+## 验证计划
+
+- 运行后端定向单测：
+  `mvn -pl ccdi-project -am "-Dtest=CcdiBankStatementMapperXmlTest,CcdiBankStatementControllerTest" "-Dsurefire.failIfNoSpecifiedTests=false" test`
+- 打包并启动真实后端后，用真实页面请求新接口，确认 `counterparty/list` 返回 200。
diff --git a/docs/plans/frontend/2026-07-20-bank-statement-counterparty-frontend-implementation.md b/docs/plans/frontend/2026-07-20-bank-statement-counterparty-frontend-implementation.md
new file mode 100644
index 00000000..10b2370a
--- /dev/null
+++ b/docs/plans/frontend/2026-07-20-bank-statement-counterparty-frontend-implementation.md
@@ -0,0 +1,32 @@
+# 流水明细对手方聚合查询前端实施计划
+
+## 背景
+
+用户希望在项目详情的“流水明细查询”中增加“对手方”视图，效果参考 lsfx 对手方列表：在同一筛选条件下按对手方汇总，查看流入、流出和总交易规模。
+
+## 实施范围
+
+- `ruoyi-ui/src/views/ccdiProject/components/detail/DetailQuery.vue`
+- `ruoyi-ui/src/api/ccdiProjectBankStatement.js`
+
+## 实施步骤
+
+1. 在流水明细结果区标题旁增加 `el-radio-group`，提供“流水明细 / 对手方”切换。
+2. 新增 `listBankStatementCounterparties` API 方法，请求后端 `/ccdi/project/bank-statement/counterparty/list`。
+3. 对手方模式下复用左侧筛选区和分页组件，隐藏“导出流水”按钮。
+4. 对手方表格展示对手方名称、流入合计、流出合计、总交易额和最近交易时间。
+5. 对手方模式默认按总交易额倒序；表格列排序映射到后端白名单字段。
+
+## 验证计划
+
+- 前端构建：
+  `npm run build:prod`
+- 真实页面验证：
+  1. 打开项目详情 `http://127.0.0.1:8081/ccdiProject/detail/42?tab=detail`。
+  2. 进入“流水明细查询”，切换到“对手方”。
+  3. 确认列表展示对手方名称、流入/流出/总交易额与分页总数。
+  4. 确认对手方表格不展示“操作”列和“查看流水”按钮。
+
+## 本机 Node 说明
+
+`.nvmrc` 指向 `14.21.3`，但本机该版本环境不可稳定提供 npm。按仓库约定，本次使用已验证可用的 Node `22.22.3` 与 npm `10.9.8` 完成构建和页面验证。
diff --git a/docs/reports/implementation/2026-07-20-bank-statement-counterparty.md b/docs/reports/implementation/2026-07-20-bank-statement-counterparty.md
new file mode 100644
index 00000000..d43cf351
--- /dev/null
+++ b/docs/reports/implementation/2026-07-20-bank-statement-counterparty.md
@@ -0,0 +1,32 @@
+# 流水明细对手方聚合查询实施记录
+
+## 修改内容
+
+- 后端新增 `GET /ccdi/project/bank-statement/counterparty/list`，按对方名称聚合流水，返回流入合计、流出合计、总交易额、笔数和最近交易时间。
+- 后端新增 `CcdiBankStatementCounterpartyVO`，并在 Mapper XML 中复用明细查询筛选条件和排序白名单。
+- 前端在项目详情“流水明细查询”中增加“流水明细 / 对手方”切换。
+- 前端新增对手方聚合表格，支持按聚合指标排序；按用户反馈移除“查看流水”入口，避免从汇总视图跳到逐笔流水后缺少明确返回路径。
+
+## 影响范围
+
+- 涉及 `ccdi-project` 的银行流水查询 Controller、Service、Mapper 与 XML。
+- 涉及 `ruoyi-ui` 的流水明细查询组件与银行流水 API 文件。
+- 不涉及数据库表结构、菜单、权限标识或初始化数据变更。
+
+## 验证情况
+
+- 后端单测通过：
+  `mvn -pl ccdi-project -am "-Dtest=CcdiBankStatementMapperXmlTest,CcdiBankStatementControllerTest" "-Dsurefire.failIfNoSpecifiedTests=false" test`
+- 前端构建通过：
+  `npm run build:prod`
+- 真实页面验证通过：
+  - 打开真实项目详情页 `http://127.0.0.1:8081/ccdiProject/detail/42?tab=detail`。
+  - 切换“对手方”后，接口 `/ccdi/project/bank-statement/counterparty/list` 返回 200，页面展示“美团、微信支付、银行转账”等聚合行和 `共 8 条`。
+  - 对手方表格已移除“操作”列和“查看流水”按钮，只保留汇总信息展示与表格排序。
+- 浏览器验证说明：`browser-use` 对应的 Chrome DevTools MCP 被本机 profile 锁占用，本次按 Playwright 技能要求使用 `@playwright/cli` 在真实页面完成验证。
+
+## 环境说明
+
+- `.nvmrc` 为 `14.21.3`，但本机 nvm 的 Node 14 环境无法稳定提供 npm。
+- 本次前端构建与页面验证使用 Node `22.22.3`、npm `10.9.8`；部分 PowerShell 会话中 nvm 切换后 PATH 不刷新，因此构建使用已确认存在的 `C:\Users\20696\AppData\Local\nvm-nodejs\npm.cmd`。
+- 前端构建存在项目既有体积告警，包含 `login-background`、`chunk-elementUI`、`chunk-libs`、`0uS5znL.docx` 等资产超限；未发现由本次代码变更引入的构建失败。
diff --git a/ruoyi-ui/src/api/ccdiProjectBankStatement.js b/ruoyi-ui/src/api/ccdiProjectBankStatement.js
index 1122a4d1..51297b2b 100644
--- a/ruoyi-ui/src/api/ccdiProjectBankStatement.js
+++ b/ruoyi-ui/src/api/ccdiProjectBankStatement.js
@@ -8,6 +8,14 @@ export function listBankStatement(query) {
   });
 }
 
+export function listBankStatementCounterparties(query) {
+  return request({
+    url: "/ccdi/project/bank-statement/counterparty/list",
+    method: "get",
+    params: query,
+  });
+}
+
 export function getBankStatementOptions(projectId) {
   return request({
     url: "/ccdi/project/bank-statement/options",
diff --git a/ruoyi-ui/src/views/ccdiProject/components/detail/DetailQuery.vue b/ruoyi-ui/src/views/ccdiProject/components/detail/DetailQuery.vue
index 435258d0..9b2e31d0 100644
--- a/ruoyi-ui/src/views/ccdiProject/components/detail/DetailQuery.vue
+++ b/ruoyi-ui/src/views/ccdiProject/components/detail/DetailQuery.vue
@@ -152,8 +152,18 @@
         <div class="shell-header">
           <div class="shell-title-group">
             <span class="shell-title">流水明细查询</span>
+            <el-radio-group
+              v-model="resultMode"
+              class="result-mode-switch"
+              size="small"
+              @change="handleResultModeChange"
+            >
+              <el-radio-button label="statement">流水明细</el-radio-button>
+              <el-radio-button label="counterparty">对手方</el-radio-button>
+            </el-radio-group>
           </div>
           <el-button
+            v-if="resultMode === 'statement'"
             size="small"
             type="primary"
             plain
@@ -164,7 +174,7 @@
           </el-button>
         </div>
         <el-alert
-          v-if="prefillTip"
+          v-if="resultMode === 'statement' && prefillTip"
           :closable="false"
           class="prefill-alert"
           show-icon
@@ -180,15 +190,24 @@
 
         <div class="result-card">
           <el-alert
-            v-if="listError"
+            v-if="resultMode === 'statement' && listError"
             :closable="false"
             class="result-alert"
             show-icon
             title="流水明细加载失败，请稍后重试"
             type="error"
           />
+          <el-alert
+            v-if="resultMode === 'counterparty' && counterpartyError"
+            :closable="false"
+            class="result-alert"
+            show-icon
+            title="对手方加载失败，请稍后重试"
+            type="error"
+          />
 
           <el-table
+            v-if="resultMode === 'statement'"
             v-loading="loading"
             :data="list"
             class="result-table"
@@ -275,9 +294,82 @@
             </el-table-column>
           </el-table>
 
+          <el-table
+            v-else
+            v-loading="loading"
+            :data="counterpartyList"
+            class="result-table counterparty-table"
+            @sort-change="handleCounterpartySortChange"
+          >
+            <template slot="empty">
+              <el-empty
+                :image-size="96"
+                description="当前筛选条件下暂无对手方"
+              />
+            </template>
+            <el-table-column
+              label="对手方名称"
+              prop="customerAccountName"
+              min-width="220"
+              :formatter="formatCounterpartyNameColumn"
+            />
+            <el-table-column
+              label="流入合计"
+              prop="inAmount"
+              width="150"
+              align="right"
+              sortable="custom"
+            >
+              <template slot-scope="scope">
+                <div class="amount-stack">
+                  <span class="amount-text amount-in">{{ formatAmount(scope.row.inAmount) }}</span>
+                  <span class="secondary-text">{{ formatCount(scope.row.inCount) }} 笔</span>
+                </div>
+              </template>
+            </el-table-column>
+            <el-table-column
+              label="流出合计"
+              prop="outAmount"
+              width="150"
+              align="right"
+              sortable="custom"
+            >
+              <template slot-scope="scope">
+                <div class="amount-stack">
+                  <span class="amount-text amount-out">{{ formatAmount(scope.row.outAmount) }}</span>
+                  <span class="secondary-text">{{ formatCount(scope.row.outCount) }} 笔</span>
+                </div>
+              </template>
+            </el-table-column>
+            <el-table-column
+              label="总交易额"
+              prop="totalAmount"
+              width="150"
+              align="right"
+              sortable="custom"
+            >
+              <template slot-scope="scope">
+                <div class="amount-stack">
+                  <span class="amount-text">{{ formatAmount(scope.row.totalAmount) }}</span>
+                  <span class="secondary-text">{{ formatCount(scope.row.totalCount) }} 笔</span>
+                </div>
+              </template>
+            </el-table-column>
+            <el-table-column
+              label="最近交易时间"
+              prop="latestTrxDate"
+              min-width="170"
+              sortable="custom"
+            >
+              <template slot-scope="scope">
+                {{ formatField(scope.row.latestTrxDate) }}
+              </template>
+            </el-table-column>
+          </el-table>
+
           <pagination
-            v-show="total > 0"
-            :total="total"
+            v-show="currentTotal > 0"
+            :total="currentTotal"
             :page.sync="queryParams.pageNum"
             :limit.sync="queryParams.pageSize"
             @pagination="handlePageChange"
@@ -411,6 +503,7 @@
 import { parseTime } from "@/utils/ruoyi";
 import {
   listBankStatement,
+  listBankStatementCounterparties,
   getBankStatementOptions,
   getBankStatementDetail,
 } from "@/api/ccdiProjectBankStatement";
@@ -427,6 +520,14 @@ const SORT_MAP = {
   displayAmount: "amount",
 };
 
+const COUNTERPARTY_SORT_MAP = {
+  inAmount: "inAmount",
+  outAmount: "outAmount",
+  totalAmount: "totalAmount",
+  totalCount: "totalCount",
+  latestTrxDate: "latestTrxDate",
+};
+
 const createDefaultQueryParams = (projectId) => ({
   projectId,
   pageNum: 1,
@@ -517,10 +618,14 @@ export default {
       optionsLoading: false,
       detailLoading: false,
       detailVisible: false,
+      resultMode: "statement",
       activeTab: "all",
       dateRange: [],
       list: [],
       total: 0,
+      counterpartyList: [],
+      counterpartyTotal: 0,
+      counterpartyError: "",
       listError: "",
       prefillTip: "",
       detailData: createEmptyDetailData(),
@@ -532,6 +637,11 @@ export default {
     this.getList();
     this.getOptions();
   },
+  computed: {
+    currentTotal() {
+      return this.resultMode === "counterparty" ? this.counterpartyTotal : this.total;
+    },
+  },
   watch: {
     dateRange(value) {
       this.queryParams.transactionStartTime = value && value[0] ? value[0] : "";
@@ -557,12 +667,19 @@ export default {
       if (!this.queryParams.projectId) {
         this.list = [];
         this.total = 0;
+        this.counterpartyList = [];
+        this.counterpartyTotal = 0;
         this.listError = "";
+        this.counterpartyError = "";
         return;
       }
 
       this.loading = true;
       try {
+        if (this.resultMode === "counterparty") {
+          await this.getCounterpartyList();
+          return;
+        }
         const res = await listBankStatement(this.queryParams);
         this.list = (res.rows || []).map((item) => ({
           ...item,
@@ -579,6 +696,19 @@ export default {
         this.loading = false;
       }
     },
+    async getCounterpartyList() {
+      try {
+        const res = await listBankStatementCounterparties(this.queryParams);
+        this.counterpartyList = res.rows || [];
+        this.counterpartyTotal = res.total || 0;
+        this.counterpartyError = "";
+      } catch (error) {
+        this.counterpartyList = [];
+        this.counterpartyTotal = 0;
+        this.counterpartyError = "加载对手方失败";
+        console.error("加载对手方失败", error);
+      }
+    },
     async getOptions() {
       this.syncProjectId();
       if (!this.queryParams.projectId) {
@@ -624,6 +754,7 @@ export default {
       if (!value || !Array.isArray(value.ourCertNos) || !value.ourCertNos.length) {
         return;
       }
+      this.resultMode = "statement";
       this.activeTab = "all";
       this.dateRange = [];
       this.queryParams = {
@@ -634,6 +765,17 @@ export default {
       this.syncProjectId();
       this.getList();
     },
+    handleResultModeChange(mode) {
+      this.queryParams.pageNum = 1;
+      if (mode === "counterparty") {
+        this.queryParams.orderBy = "totalAmount";
+        this.queryParams.orderDirection = "desc";
+      } else {
+        this.queryParams.orderBy = "trxDate";
+        this.queryParams.orderDirection = "desc";
+      }
+      this.getList();
+    },
     handleTabChange(tab) {
       const tabName = tab && tab.name ? tab.name : this.activeTab;
       this.activeTab = tabName;
@@ -650,6 +792,15 @@ export default {
       }
       this.getList();
     },
+    handleCounterpartySortChange({ prop, order }) {
+      this.queryParams.orderBy = COUNTERPARTY_SORT_MAP[prop] || "totalAmount";
+      this.queryParams.orderDirection = order === "ascending" ? "asc" : "desc";
+      if (!order) {
+        this.queryParams.orderBy = "totalAmount";
+        this.queryParams.orderDirection = "desc";
+      }
+      this.getList();
+    },
     handlePageChange(pageInfo) {
       if (typeof pageInfo === "number") {
         this.queryParams.pageNum = pageInfo;
@@ -743,6 +894,13 @@ export default {
         maximumFractionDigits: 2,
       });
     },
+    formatCount(value) {
+      if (value === null || value === undefined || value === "") {
+        return 0;
+      }
+      const count = Number(value);
+      return Number.isNaN(count) ? 0 : count;
+    },
     formatSignedAmount(value) {
       if (value === null || value === undefined || value === "") {
         return "-";
@@ -766,6 +924,15 @@ export default {
       }
       return this.formatField(detail.customerAccountName);
     },
+    formatCounterpartyRowName(row) {
+      if (!row || row.nameEmpty || !row.customerAccountName) {
+        return "为空";
+      }
+      return this.formatField(row.customerAccountName);
+    },
+    formatCounterpartyNameColumn(row) {
+      return this.formatCounterpartyRowName(row);
+    },
     formatOriginalFileName(detail) {
       if (!detail) {
         return "暂无原始文件";
@@ -876,6 +1043,14 @@ export default {
   color: #909399;
 }
 
+.result-mode-switch {
+  margin-top: 8px;
+
+  :deep(.el-radio-button__inner) {
+    min-width: 82px;
+  }
+}
+
 .shell-header {
   display: flex;
   align-items: flex-start;
@@ -1011,6 +1186,15 @@ export default {
   font-weight: 600;
 }
 
+.amount-stack {
+  display: inline-flex;
+  flex-direction: column;
+  align-items: flex-end;
+  gap: 4px;
+  min-width: 0;
+  line-height: 20px;
+}
+
 .amount-in {
   color: #67c23a;
 }