diff --git a/maku-boot-system/src/main/java/net/maku/system/controller/SysRoleController.java b/maku-boot-system/src/main/java/net/maku/system/controller/SysRoleController.java
index 82fe0f5..644a227 100644
--- a/maku-boot-system/src/main/java/net/maku/system/controller/SysRoleController.java
+++ b/maku-boot-system/src/main/java/net/maku/system/controller/SysRoleController.java
@@ -22,8 +22,8 @@ import net.maku.system.vo.SysUserVO;
 import org.springdoc.core.annotations.ParameterObject;
 import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.web.bind.annotation.*;
-
 import java.util.List;
+import java.util.stream.Collectors;
 
 /**
  * 角色管理
@@ -152,10 +152,24 @@ public class SysRoleController {
 
     @PostMapping("user/{roleId}")
     @Operation(summary = "分配角色给用户列表")
-    @OperateLog(type = OperateTypeEnum.DELETE)
+    @OperateLog(type = OperateTypeEnum.UPDATE)
     @PreAuthorize("hasAuthority('sys:role:update')")
     public Result<String> userSave(@PathVariable("roleId") Long roleId, @RequestBody List<Long> userIdList) {
-        sysUserRoleService.saveUserList(roleId, userIdList);
+        if(userIdList.isEmpty()) {
+            return Result.error("UserId is empty!");
+        }
+        //查询数据库该角色对应的用户列表
+        List<Long> existsUserIdList = sysUserRoleService.getExistsUserIdList(roleId);
+
+        //取出需要新增的用户列表
+        List<Long> addUserIdList = userIdList.stream()
+            .filter(userId -> !existsUserIdList.contains(userId))
+            .collect(Collectors.toList());
+
+        if(addUserIdList.isEmpty()) {
+            return Result.error("UserId existed!");
+        }
+        sysUserRoleService.saveUserList(roleId, addUserIdList);
 
         return Result.ok();
     }
diff --git a/maku-boot-system/src/main/java/net/maku/system/dao/SysUserRoleDao.java b/maku-boot-system/src/main/java/net/maku/system/dao/SysUserRoleDao.java
index dad3115..7eacb71 100644
--- a/maku-boot-system/src/main/java/net/maku/system/dao/SysUserRoleDao.java
+++ b/maku-boot-system/src/main/java/net/maku/system/dao/SysUserRoleDao.java
@@ -23,4 +23,12 @@ public interface SysUserRoleDao extends BaseDao<SysUserRoleEntity> {
      * @return  返回角色ID列表
      */
     List<Long> getRoleIdList(@Param("userId") Long userId);
+
+    /**
+     * 根据角色ID查询对应的用户ID列表
+     * @param roleId  角色ID
+     *
+     * @return  返回用户ID列表
+     */
+    List<Long> getExistsUserIdList(@Param("roleId") Long roleId);
 }
\ No newline at end of file
diff --git a/maku-boot-system/src/main/java/net/maku/system/service/SysUserRoleService.java b/maku-boot-system/src/main/java/net/maku/system/service/SysUserRoleService.java
index 44837f7..58683a9 100644
--- a/maku-boot-system/src/main/java/net/maku/system/service/SysUserRoleService.java
+++ b/maku-boot-system/src/main/java/net/maku/system/service/SysUserRoleService.java
@@ -51,4 +51,10 @@ public interface SysUserRoleService extends BaseService<SysUserRoleEntity> {
      * @param userId  用户ID
      */
     List<Long> getRoleIdList(Long userId);
+
+    /**
+     * 根据角色ID查询对应的用户ID列表
+     * @param roleId  角色ID
+     */
+    List<Long> getExistsUserIdList(Long roleId);
 }
\ No newline at end of file
diff --git a/maku-boot-system/src/main/java/net/maku/system/service/impl/SysUserRoleServiceImpl.java b/maku-boot-system/src/main/java/net/maku/system/service/impl/SysUserRoleServiceImpl.java
index 026615e..9f28d9b 100644
--- a/maku-boot-system/src/main/java/net/maku/system/service/impl/SysUserRoleServiceImpl.java
+++ b/maku-boot-system/src/main/java/net/maku/system/service/impl/SysUserRoleServiceImpl.java
@@ -91,4 +91,9 @@ public class SysUserRoleServiceImpl extends BaseServiceImpl<SysUserRoleDao, SysU
     public List<Long> getRoleIdList(Long userId) {
         return baseMapper.getRoleIdList(userId);
     }
+
+    @Override
+    public List<Long> getExistsUserIdList(Long roleId) {
+        return baseMapper.getExistsUserIdList(roleId);
+    }
 }
\ No newline at end of file
diff --git a/maku-boot-system/src/main/resources/mapper/SysUserRoleDao.xml b/maku-boot-system/src/main/resources/mapper/SysUserRoleDao.xml
index b39cf6d..f7aeb22 100644
--- a/maku-boot-system/src/main/resources/mapper/SysUserRoleDao.xml
+++ b/maku-boot-system/src/main/resources/mapper/SysUserRoleDao.xml
@@ -7,4 +7,7 @@
         select role_id from sys_user_role where user_id = #{userId} and deleted = 0
     </select>
 
+    <select id="getExistsUserIdList" resultType="long">
+        select user_id from sys_user_role where role_id = #{roleId} and deleted = 0
+    </select>
 </mapper>
\ No newline at end of file