diff --git a/docs/plans/backend/2026-03-19-lsfx-inner-flow-count-backend-implementation.md b/docs/plans/backend/2026-03-19-lsfx-inner-flow-count-backend-implementation.md
new file mode 100644
index 00000000..b2aa987e
--- /dev/null
+++ b/docs/plans/backend/2026-03-19-lsfx-inner-flow-count-backend-implementation.md
@@ -0,0 +1,58 @@
+# lsfx-mock-server 兰溪本地流水条数调整实施文档
+
+## 变更目标
+
+将 `lsfx-mock-server` 中兰溪本地流水相关链路的条数统一调整为固定 `200` 条，保证以下两个口径一致：
+
+- `/watson/api/project/getJZFileOrZjrcuFile` 创建的 `FileRecord.total_records`
+- `/watson/api/project/getBSByLogId` 返回的 `data.totalCount`
+
+## 实施内容
+
+### 1. 调整流水列表总条数
+
+修改文件：
+
+- `lsfx-mock-server/services/statement_service.py`
+
+实施内容：
+
+- 新增 `StatementService.FIXED_TOTAL_COUNT = 200`
+- 将 `get_bank_statement` 首次缓存生成总条数的逻辑由随机 `1200-1500` 调整为固定 `200`
+
+### 2. 调整兰溪本地流水落库条数
+
+修改文件：
+
+- `lsfx-mock-server/services/file_service.py`
+
+实施内容：
+
+- 新增 `FileService.INNER_FLOW_TOTAL_RECORDS = 200`
+- 将 `fetch_inner_flow` 创建 `FileRecord` 时的 `total_records` 由随机 `100-300` 调整为固定 `200`
+
+### 3. 补充测试
+
+修改文件：
+
+- `lsfx-mock-server/tests/test_statement_service.py`
+- `lsfx-mock-server/tests/test_file_service.py`
+
+实施内容：
+
+- 增加 `get_bank_statement` 总条数固定为 `200` 的断言
+- 增加 `fetch_inner_flow` 创建的 `FileRecord.total_records` 固定为 `200` 的断言
+
+## 验证记录
+
+执行命令：
+
+```bash
+python3 -m pytest lsfx-mock-server/tests/test_statement_service.py -k fixed_total_count_200 -q
+python3 -m pytest lsfx-mock-server/tests/test_file_service.py -k fetch_inner_flow_persists_primary_binding_record -q
+```
+
+验证结果：
+
+- 两条目标测试均通过
+- 当前环境存在 `PydanticDeprecatedSince20` 警告，但不影响本次条数调整
diff --git a/lsfx-mock-server/services/file_service.py b/lsfx-mock-server/services/file_service.py
index 29f6f4be..4d97875e 100644
--- a/lsfx-mock-server/services/file_service.py
+++ b/lsfx-mock-server/services/file_service.py
@@ -69,6 +69,8 @@ class FileRecord:
 class FileService:
     """文件上传和解析服务"""
 
+    INNER_FLOW_TOTAL_RECORDS = 200
+
     def __init__(self, staff_identity_repository=None):
         self.file_records: Dict[int, FileRecord] = {}  # logId -> FileRecord
         self.log_counter = settings.INITIAL_LOG_ID
@@ -532,7 +534,7 @@ class FileService:
             primary_enterprise_name=primary_enterprise_name,
             primary_account_no=primary_account_no,
             file_size=random.randint(10000, 100000),
-            total_records=random.randint(100, 300),
+            total_records=self.INNER_FLOW_TOTAL_RECORDS,
             trx_date_start_id=data_start_date_id,
             trx_date_end_id=data_end_date_id,
             le_id=10000 + random.randint(0, 9999),
diff --git a/lsfx-mock-server/services/statement_service.py b/lsfx-mock-server/services/statement_service.py
index 38b48064..e5aa1496 100644
--- a/lsfx-mock-server/services/statement_service.py
+++ b/lsfx-mock-server/services/statement_service.py
@@ -17,6 +17,8 @@ logger = logging.getLogger(__name__)
 class StatementService:
     """流水数据服务"""
 
+    FIXED_TOTAL_COUNT = 200
+
     def __init__(self, file_service=None):
         # 缓存：logId -> (statements_list, total_count)
         self._cache: Dict[int, tuple] = {}
@@ -199,8 +201,7 @@ class StatementService:
             page_size = request.pageSize
 
         if log_id not in self._cache:
-            total_rng = random.Random(f"total:{log_id}")
-            total_count = total_rng.randint(1200, 1500)
+            total_count = self.FIXED_TOTAL_COUNT
             all_statements = self._generate_statements(group_id, log_id, total_count)
             self._cache[log_id] = (all_statements, total_count)
 
diff --git a/lsfx-mock-server/tests/test_file_service.py b/lsfx-mock-server/tests/test_file_service.py
index eded407b..7a1b5a9a 100644
--- a/lsfx-mock-server/tests/test_file_service.py
+++ b/lsfx-mock-server/tests/test_file_service.py
@@ -153,3 +153,4 @@ def test_fetch_inner_flow_persists_primary_binding_record(monkeypatch):
     assert record.primary_account_no == "6210987654321098"
     assert record.enterprise_name_list == ["行内主体"]
     assert record.account_no_list == ["6210987654321098"]
+    assert record.total_records == 200
diff --git a/lsfx-mock-server/tests/test_statement_service.py b/lsfx-mock-server/tests/test_statement_service.py
index 6b1464e1..21f91523 100644
--- a/lsfx-mock-server/tests/test_statement_service.py
+++ b/lsfx-mock-server/tests/test_statement_service.py
@@ -152,6 +152,18 @@ def test_get_bank_statement_should_keep_same_cached_result_for_same_log_id():
     assert page1["data"]["bankStatementList"] == page2["data"]["bankStatementList"]
 
 
+def test_get_bank_statement_should_use_fixed_total_count_200():
+    """兰溪本地流水列表首次生成后，总条数应固定为 200。"""
+    service = StatementService()
+
+    response = service.get_bank_statement(
+        {"groupId": 1000, "logId": 30002, "pageNow": 1, "pageSize": 500}
+    )
+
+    assert response["data"]["totalCount"] == 200
+    assert len(response["data"]["bankStatementList"]) == 200
+
+
 def test_get_bank_statement_uses_primary_binding_from_file_service(monkeypatch):
     """同一 logId 的流水记录必须复用 FileService 中的主体与账号绑定。"""
     file_service = FileService(staff_identity_repository=FakeStaffIdentityRepository())