diff --git a/backend/services/identity-service/src/application/services/pending-action.service.ts b/backend/services/identity-service/src/application/services/pending-action.service.ts
index 6fa8ba20..e9d6b996 100644
--- a/backend/services/identity-service/src/application/services/pending-action.service.ts
+++ b/backend/services/identity-service/src/application/services/pending-action.service.ts
@@ -103,6 +103,7 @@ export class PendingActionService {
 
   /**
    * 创建用户待办操作 (后台管理)
+   * 支持通过 userId (纯数字) 或 accountSequence (如 D25122700022) 查找用户
    */
   async createAction(
     dto: CreatePendingActionDto,
@@ -110,11 +111,8 @@ export class PendingActionService {
   ): Promise<PendingActionResponseDto> {
     this.logger.log(`[PendingAction] Creating action for user: ${dto.userId}, code: ${dto.actionCode}`);
 
-    // 验证用户是否存在
-    const user = await this.prisma.userAccount.findUnique({
-      where: { userId: BigInt(dto.userId) },
-      select: { userId: true },
-    });
+    // 查找用户：支持 userId (纯数字) 或 accountSequence (如 D25122700022)
+    const user = await this.findUserByIdOrSequence(dto.userId);
 
     if (!user) {
       throw new ApplicationError('用户不存在');
@@ -122,7 +120,7 @@ export class PendingActionService {
 
     const action = await this.prisma.userPendingAction.create({
       data: {
-        userId: BigInt(dto.userId),
+        userId: user.userId,
         actionCode: dto.actionCode,
         actionParams: dto.actionParams ?? undefined,
         priority: dto.priority ?? 0,
@@ -138,6 +136,7 @@ export class PendingActionService {
 
   /**
    * 批量创建用户待办操作 (后台管理)
+   * 支持通过 userId (纯数字) 或 accountSequence (如 D25122700022) 查找用户
    */
   async batchCreateActions(
     dto: BatchCreatePendingActionDto,
@@ -148,22 +147,19 @@ export class PendingActionService {
     let successCount = 0;
     const failedUserIds: string[] = [];
 
-    for (const userId of dto.userIds) {
+    for (const userIdOrSequence of dto.userIds) {
       try {
-        // 验证用户是否存在
-        const user = await this.prisma.userAccount.findUnique({
-          where: { userId: BigInt(userId) },
-          select: { userId: true },
-        });
+        // 查找用户：支持 userId 或 accountSequence
+        const user = await this.findUserByIdOrSequence(userIdOrSequence);
 
         if (!user) {
-          failedUserIds.push(userId);
+          failedUserIds.push(userIdOrSequence);
           continue;
         }
 
         await this.prisma.userPendingAction.create({
           data: {
-            userId: BigInt(userId),
+            userId: user.userId,
             actionCode: dto.actionCode,
             actionParams: dto.actionParams ?? undefined,
             priority: dto.priority ?? 0,
@@ -174,8 +170,8 @@ export class PendingActionService {
 
         successCount++;
       } catch (error) {
-        this.logger.warn(`[PendingAction] Failed to create action for user: ${userId}, error: ${error.message}`);
-        failedUserIds.push(userId);
+        this.logger.warn(`[PendingAction] Failed to create action for user: ${userIdOrSequence}, error: ${error.message}`);
+        failedUserIds.push(userIdOrSequence);
       }
     }
 
@@ -190,6 +186,7 @@ export class PendingActionService {
 
   /**
    * 查询用户待办操作列表 (后台管理)
+   * 支持通过 userId (纯数字) 或 accountSequence (如 D25122700022) 筛选用户
    */
   async queryActions(dto: QueryPendingActionsDto): Promise<PendingActionListResponseDto> {
     const page = dto.page ?? 1;
@@ -199,7 +196,14 @@ export class PendingActionService {
     const where: any = {};
 
     if (dto.userId) {
-      where.userId = BigInt(dto.userId);
+      // 支持 userId 或 accountSequence 筛选
+      const user = await this.findUserByIdOrSequence(dto.userId);
+      if (user) {
+        where.userId = user.userId;
+      } else {
+        // 用户不存在，返回空结果
+        return { items: [], total: 0, page, limit };
+      }
     }
     if (dto.actionCode) {
       where.actionCode = dto.actionCode;
@@ -342,6 +346,27 @@ export class PendingActionService {
 
   // ==================== Helper Methods ====================
 
+  /**
+   * 通过 userId (纯数字) 或 accountSequence (如 D25122700022) 查找用户
+   */
+  private async findUserByIdOrSequence(
+    userIdOrSequence: string,
+  ): Promise<{ userId: bigint } | null> {
+    // 检查是否是纯数字 (userId)
+    if (/^\d+$/.test(userIdOrSequence)) {
+      return this.prisma.userAccount.findUnique({
+        where: { userId: BigInt(userIdOrSequence) },
+        select: { userId: true },
+      });
+    }
+
+    // 否则尝试通过 accountSequence 查找
+    return this.prisma.userAccount.findUnique({
+      where: { accountSequence: userIdOrSequence },
+      select: { userId: true },
+    });
+  }
+
   private toResponseDto(action: any): PendingActionResponseDto {
     return {
       id: action.id.toString(),