diff --git a/ruoyi-ccdi/src/main/java/com/ruoyi/ccdi/service/ICcdiPurchaseTransactionImportService.java b/ruoyi-ccdi/src/main/java/com/ruoyi/ccdi/service/ICcdiPurchaseTransactionImportService.java
new file mode 100644
index 0000000..f4ccdd0
--- /dev/null
+++ b/ruoyi-ccdi/src/main/java/com/ruoyi/ccdi/service/ICcdiPurchaseTransactionImportService.java
@@ -0,0 +1,42 @@
+package com.ruoyi.ccdi.service;
+
+import com.ruoyi.ccdi.domain.excel.CcdiPurchaseTransactionExcel;
+import com.ruoyi.ccdi.domain.vo.ImportFailureVO;
+import com.ruoyi.ccdi.domain.vo.ImportStatusVO;
+
+import java.util.List;
+
+/**
+ * 采购交易信息异步导入服务层
+ *
+ * @author ruoyi
+ * @date 2026-02-06
+ */
+public interface ICcdiPurchaseTransactionImportService {
+
+    /**
+     * 异步导入采购交易数据
+     *
+     * @param excelList        Excel数据列表
+     * @param isUpdateSupport  是否更新已存在的数据
+     * @param taskId           任务ID
+     * @param userName         当前用户名
+     */
+    void importTransactionAsync(List<CcdiPurchaseTransactionExcel> excelList, Boolean isUpdateSupport, String taskId, String userName);
+
+    /**
+     * 查询导入状态
+     *
+     * @param taskId 任务ID
+     * @return 导入状态信息
+     */
+    ImportStatusVO getImportStatus(String taskId);
+
+    /**
+     * 获取导入失败记录
+     *
+     * @param taskId 任务ID
+     * @return 失败记录列表
+     */
+    List<ImportFailureVO> getImportFailures(String taskId);
+}