diff --git a/backend/src/main/java/io/dataease/auth/server/AuthServer.java b/backend/src/main/java/io/dataease/auth/server/AuthServer.java
index b94eca461e..53dffa07f1 100644
--- a/backend/src/main/java/io/dataease/auth/server/AuthServer.java
+++ b/backend/src/main/java/io/dataease/auth/server/AuthServer.java
@@ -77,6 +77,7 @@ public class AuthServer implements AuthApi {
                 ldapAddRequest.setEnabled(1L);
                 ldapAddRequest.setDeptId(1L);
                 ldapAddRequest.setRoleIds(new ArrayList<Long>(){{add(2L);}});
+                sysUserService.validateExistUser(ldapUserEntity.getUserName(),  ldapUserEntity.getEmail());
                 sysUserService.saveLdapUsers(ldapAddRequest);
             }
             
diff --git a/backend/src/main/java/io/dataease/plugins/server/SSOServer.java b/backend/src/main/java/io/dataease/plugins/server/SSOServer.java
index b50257be85..a102174941 100644
--- a/backend/src/main/java/io/dataease/plugins/server/SSOServer.java
+++ b/backend/src/main/java/io/dataease/plugins/server/SSOServer.java
@@ -54,6 +54,7 @@ public class SSOServer {
         SSOUserInfo ssoUserInfo = oidcXpackService.requestUserInfo(config, ssoToken.getAccessToken());
         SysUserEntity sysUserEntity = authUserService.getUserBySub(ssoUserInfo.getSub());
         if(null == sysUserEntity){
+            sysUserService.validateExistUser(ssoUserInfo.getUsername(), ssoUserInfo.getEmail());
             sysUserService.saveOIDCUser(ssoUserInfo);
             sysUserEntity = authUserService.getUserBySub(ssoUserInfo.getSub());
         }
diff --git a/backend/src/main/java/io/dataease/service/sys/SysUserService.java b/backend/src/main/java/io/dataease/service/sys/SysUserService.java
index 9c704a4883..2a102f7d94 100644
--- a/backend/src/main/java/io/dataease/service/sys/SysUserService.java
+++ b/backend/src/main/java/io/dataease/service/sys/SysUserService.java
@@ -299,6 +299,33 @@ public class SysUserService {
         return null;
     }
 
+    public void validateExistUser(String userName, String email) {
+        SysUserExample example = new SysUserExample();
+        if (StringUtils.isNotBlank(userName)) {
+            example.createCriteria().andUsernameEqualTo(userName);
+            List<SysUser> users = sysUserMapper.selectByExample(example);
+            if(CollectionUtils.isNotEmpty(users)) {
+                throw new RuntimeException("用户ID【"+userName+"】已存在,请联系管理员");
+            }
+        }
+
+        /* if (StringUtils.isNotBlank(nickName)) {
+            example.createCriteria().andNickNameEqualTo(nickName);
+            List<SysUser> users = sysUserMapper.selectByExample(example);
+            if(CollectionUtils.isNotEmpty(users)) {
+                throw new RuntimeException("用户姓名【"+nickName+"】已存在,请联系管理员");
+            }
+        } */
+
+        if (StringUtils.isNotBlank(email)) {
+            example.createCriteria().andEmailEqualTo(email);
+            List<SysUser> users = sysUserMapper.selectByExample(example);
+            if(CollectionUtils.isNotEmpty(users)) {
+                throw new RuntimeException("用户邮箱【"+email+"】已存在,请联系管理员");
+            }
+        }
+    }
+
 
     public List<SysUser> users(List<Long> userIds) {
         return userIds.stream().map(sysUserMapper::selectByPrimaryKey).collect(Collectors.toList());