diff --git a/src/main/java/com/gxwebsoft/app/entity/AppUser.java b/src/main/java/com/gxwebsoft/app/entity/AppUser.java
index a5d3ad3..09ade12 100644
--- a/src/main/java/com/gxwebsoft/app/entity/AppUser.java
+++ b/src/main/java/com/gxwebsoft/app/entity/AppUser.java
@@ -35,9 +35,15 @@ public class AppUser implements Serializable {
     @Schema(description = "用户名（冗余）")
     private String username;
 
+    @Schema(description = "昵称（冗余）")
+    private String nickname;
+
     @Schema(description = "头像（冗余）")
     private String avatar;
 
+    @Schema(description = "手机号（冗余，脱敏存储）")
+    private String phone;
+
     @Schema(description = "角色: owner/admin/developer/viewer")
     private String role;
 
diff --git a/src/main/java/com/gxwebsoft/app/mapper/xml/AppUserMapper.xml b/src/main/java/com/gxwebsoft/app/mapper/xml/AppUserMapper.xml
index 46d080d..eab0732 100644
--- a/src/main/java/com/gxwebsoft/app/mapper/xml/AppUserMapper.xml
+++ b/src/main/java/com/gxwebsoft/app/mapper/xml/AppUserMapper.xml
@@ -2,13 +2,11 @@
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="com.gxwebsoft.app.mapper.AppUserMapper">
 
-    <!-- 关联查询sql -->
+    <!-- 关联查询sql（已移除跨库 JOIN gxwebsoft_core.sys_user，用户信息从冗余字段读取） -->
     <sql id="selectSql">
-        SELECT a.*, w.website_name, w.website_code, w.website_icon,
-               u.nickname, u.avatar AS user_avatar, u.phone
+        SELECT a.*, w.website_name, w.website_code, w.website_icon
         FROM app_user a
         LEFT JOIN cms_website w ON a.website_id = w.website_id AND w.deleted = 0
-        LEFT JOIN gxwebsoft_core.sys_user u ON a.user_id = u.user_id
         <where>
             <if test="param.id != null">
                 AND a.id = #{param.id}
@@ -21,7 +19,7 @@
             </if>
             <if test="param.username != null and param.username != ''">
                 AND (a.username LIKE CONCAT('%', #{param.username}, '%')
-                  OR u.nickname LIKE CONCAT('%', #{param.username}, '%'))
+                  OR a.nickname LIKE CONCAT('%', #{param.username}, '%'))
             </if>
             <if test="param.role != null and param.role != ''">
                 AND a.role = #{param.role}
@@ -46,8 +44,7 @@
             </if>
             <if test="param.keywords != null and param.keywords != ''">
                 AND (a.username LIKE CONCAT('%', #{param.keywords}, '%')
-                  OR u.nickname LIKE CONCAT('%', #{param.keywords}, '%')
-                )
+                  OR a.nickname LIKE CONCAT('%', #{param.keywords}, '%'))
             </if>
         </where>
     </sql>
diff --git a/src/main/java/com/gxwebsoft/app/service/impl/AppUserServiceImpl.java b/src/main/java/com/gxwebsoft/app/service/impl/AppUserServiceImpl.java
index 47ff990..0732a7d 100644
--- a/src/main/java/com/gxwebsoft/app/service/impl/AppUserServiceImpl.java
+++ b/src/main/java/com/gxwebsoft/app/service/impl/AppUserServiceImpl.java
@@ -10,9 +10,12 @@ import com.gxwebsoft.app.entity.AppUser;
 import com.gxwebsoft.app.param.AppUserParam;
 import com.gxwebsoft.common.core.web.PageParam;
 import com.gxwebsoft.common.core.web.PageResult;
+import com.gxwebsoft.common.system.entity.User;
+import com.gxwebsoft.common.system.service.UserService;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 
+import javax.annotation.Resource;
 import java.time.LocalDateTime;
 import java.util.List;
 
@@ -26,6 +29,10 @@ import java.util.List;
 @Service
 public class AppUserServiceImpl extends ServiceImpl<AppUserMapper, AppUser> implements AppUserService {
 
+    /** 注入同 jar 包内的 UserService，用于写入冗余用户信息，不做跨库 JOIN */
+    @Resource
+    private UserService userService;
+
     @Override
     public PageResult<AppUser> pageRel(AppUserParam param) {
         PageParam<AppUser, AppUserParam> page = new PageParam<>(param);
@@ -56,6 +63,12 @@ public class AppUserServiceImpl extends ServiceImpl<AppUserMapper, AppUser> impl
             throw new RuntimeException("该用户已经是应用成员");
         }
 
+        // 查询用户基础信息并冗余写入，避免跨库 JOIN
+        User sysUser = userService.getByIdIgnoreTenant(userId);
+        if (sysUser == null) {
+            throw new RuntimeException("用户不存在，userId=" + userId);
+        }
+
         AppUser appUser = new AppUser();
         appUser.setWebsiteId(websiteId);
         appUser.setUserId(userId);
@@ -64,9 +77,14 @@ public class AppUserServiceImpl extends ServiceImpl<AppUserMapper, AppUser> impl
         appUser.setInviteTime(LocalDateTime.now());
         appUser.setStatus(0);
         appUser.setSortNumber(0);
+        // 冗余写入用户基础信息，彻底解除跨库 JOIN 依赖
+        appUser.setUsername(sysUser.getUsername());
+        appUser.setNickname(sysUser.getNickname());
+        appUser.setAvatar(sysUser.getAvatar());
+        appUser.setPhone(sysUser.getPhone());
 
         save(appUser);
-        log.info("邀请成员成功，websiteId={}, userId={}, role={}", websiteId, userId, role);
+        log.info("邀请成员成功，websiteId={}, userId={}, username={}, role={}", websiteId, userId, sysUser.getUsername(), role);
         return appUser;
     }