diff --git a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/IFlwTaskAssigneeService.java b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/IFlwTaskAssigneeService.java
index 90d87e37f..7264ee079 100644
--- a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/IFlwTaskAssigneeService.java
+++ b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/IFlwTaskAssigneeService.java
@@ -28,6 +28,6 @@ public interface IFlwTaskAssigneeService {
      * @param storageIds 多个存储标识符字符串（逗号分隔）
      * @return 合并后的用户列表，去重后返回，非法格式的标识将被跳过
      */
-    List<UserDTO> fetchUsersByStorageIds(String storageIds);
+    List<UserDTO> fetchUsersByStorageIds(List<String> storageIds);
 
 }
diff --git a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwCommonServiceImpl.java b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwCommonServiceImpl.java
index 086ae6870..35434d389 100644
--- a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwCommonServiceImpl.java
+++ b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwCommonServiceImpl.java
@@ -72,10 +72,13 @@ public class FlwCommonServiceImpl implements IFlwCommonService {
         IFlwTaskAssigneeService taskAssigneeService = SpringUtils.getBean(IFlwTaskAssigneeService.class);
         Map<String, List<User>> userListMap = StreamUtils.groupByKey(userList, User::getType);
         for (Map.Entry<String, List<User>> entry : userListMap.entrySet()) {
-            List<User> entryValue = entry.getValue();
-            String processedBys = StreamUtils.join(entryValue, User::getProcessedBy);
+            List<String> processedBys = entry.getValue().stream()
+                .map(User::getProcessedBy)
+                .filter(StringUtils::isNotBlank)
+                .distinct()
+                .collect(Collectors.toList());
             // 根据 processedBy 前缀判断处理人类型，分别获取用户列表
-            List<UserDTO> users = taskAssigneeService.fetchUsersByStorageId(processedBys);
+            List<UserDTO> users = taskAssigneeService.fetchUsersByStorageIds(processedBys);
             // 转换为 FlowUser 并添加到结果集合
             if (CollUtil.isNotEmpty(users)) {
                 users.forEach(dto -> {
diff --git a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwTaskAssigneeServiceImpl.java b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwTaskAssigneeServiceImpl.java
index 67c58b001..9f847e184 100644
--- a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwTaskAssigneeServiceImpl.java
+++ b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/service/impl/FlwTaskAssigneeServiceImpl.java
@@ -176,7 +176,7 @@ public class FlwTaskAssigneeServiceImpl implements IFlwTaskAssigneeService, Hand
     public List<UserDTO> fetchUsersByStorageId(String storageId) {
         Pair<TaskAssigneeEnum, Long> parsed = this.parseStorageId(storageId);
         if (parsed == null) {
-            return Collections.emptyList();
+            return List.of();
         }
         return this.getUsersByType(parsed.getKey(), Collections.singletonList(parsed.getValue()));
     }
@@ -190,9 +190,12 @@ public class FlwTaskAssigneeServiceImpl implements IFlwTaskAssigneeService, Hand
      * @return 合并后的用户列表，去重后返回，非法格式的标识将被跳过
      */
     @Override
-    public List<UserDTO> fetchUsersByStorageIds(String storageIds) {
+    public List<UserDTO> fetchUsersByStorageIds(List<String> storageIds) {
+        if (CollUtil.isEmpty(storageIds)) {
+            return List.of();
+        }
         Map<TaskAssigneeEnum, List<Long>> typeIdMap = new EnumMap<>(TaskAssigneeEnum.class);
-        for (String storageId : storageIds.split(StrUtil.COMMA)) {
+        for (String storageId : storageIds) {
             Pair<TaskAssigneeEnum, Long> parsed = this.parseStorageId(storageId);
             if (parsed != null) {
                 typeIdMap.computeIfAbsent(parsed.getKey(), k -> new ArrayList<>()).add(parsed.getValue());