diff --git a/backend/roomroot-admin/src/main/java/com/roomroot/web/controller/jwgl/JYSController.java b/backend/roomroot-admin/src/main/java/com/roomroot/web/controller/jwgl/JYSController.java
index fb76d9d92..1ecc7bec9 100644
--- a/backend/roomroot-admin/src/main/java/com/roomroot/web/controller/jwgl/JYSController.java
+++ b/backend/roomroot-admin/src/main/java/com/roomroot/web/controller/jwgl/JYSController.java
@@ -1,5 +1,6 @@
 package com.roomroot.web.controller.jwgl;
 
+import com.roomroot.common.core.domain.entity.SysUser;
 import com.roomroot.common.utils.StringUtils;
 import com.roomroot.jwgl.dto.faculty.AddTeacherDTO;
 import com.roomroot.jwgl.dto.jys.ElectiveCourseBatchDTO;
@@ -225,7 +226,13 @@ public class JYSController {
         if (entity == null) {
             return Result.error("教员不存在：" + jybh);
         }
-        return Result.success(orgSyncService.ensureTeacherUser(entity, loginName, password, roleId));
+        SysUser user = orgSyncService.ensureTeacherUser(entity, loginName, password, roleId);
+        String expected = StringUtils.hasText(loginName) ? loginName.trim() : jybh;
+        if (!expected.equals(user.getUserName())) {
+            return Result.success("登录名 " + expected + " 已被无关账号占用，已自动改用 "
+                    + user.getUserName(), user.getUserId());
+        }
+        return Result.success(user.getUserId());
     }
 
     /**
diff --git a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/OrgSyncService.java b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/OrgSyncService.java
index 46b446cb1..3b73458fa 100644
--- a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/OrgSyncService.java
+++ b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/OrgSyncService.java
@@ -57,9 +57,10 @@ public interface OrgSyncService {
      * @param loginName 登录名（空则取教员编号）
      * @param password  初始密码明文（空则取统一初始值）
      * @param roleId    角色ID（空则取默认教员角色 101）
-     * @return 用户编号 USER_ID
+     * @return 创建/认领到的用户实体（含实际登录名，供调用方提示改名）
      */
-    Long ensureTeacherUser(JYB jyb, String loginName, String password, Long roleId);
+    com.roomroot.common.core.domain.entity.SysUser ensureTeacherUser(
+            JYB jyb, String loginName, String password, Long roleId);
 
     /**
      * 教员信息变更后同步账号（调教研室迁移部门、改名、改手机号、离职禁用/复职启用）。
diff --git a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/impl/OrgSyncServiceImpl.java b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/impl/OrgSyncServiceImpl.java
index b6f734107..c71a64841 100644
--- a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/impl/OrgSyncServiceImpl.java
+++ b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/service/impl/OrgSyncServiceImpl.java
@@ -55,6 +55,9 @@ public class OrgSyncServiceImpl implements OrgSyncService {
         if (jysb == null || StringUtils.isBlank(jysb.getJysdh())) {
             throw new BusinessException("教研室信息不完整，无法同步组织部门");
         }
+        if (jysb.getTy() != null && jysb.getTy() == 1) {
+            throw new BusinessException("教研室「" + jysb.getJysmc() + "」已停用，不创建组织部门");
+        }
         // 已映射：校验部门仍存在（被手工删除则重建）
         if (jysb.getBmbh() != null) {
             SysDept mapped = deptService.selectDeptById(jysb.getBmbh());
@@ -140,7 +143,7 @@ public class OrgSyncServiceImpl implements OrgSyncService {
 
     @Override
     @Transactional(rollbackFor = Exception.class)
-    public Long ensureTeacherUser(JYB jyb, String loginName, String password, Long roleId) {
+    public SysUser ensureTeacherUser(JYB jyb, String loginName, String password, Long roleId) {
         if (jyb == null || StringUtils.isBlank(jyb.getJybh())) {
             throw new BusinessException("教员信息不完整，无法创建账号");
         }
@@ -148,7 +151,7 @@ public class OrgSyncServiceImpl implements OrgSyncService {
         if (jyb.getYhbh() != null) {
             SysUser mapped = userService.selectUserById(jyb.getYhbh());
             if (mapped != null && !"2".equals(mapped.getDelFlag())) {
-                return jyb.getYhbh();
+                return mapped;
             }
         }
         if (jyb.getLzzt() != null && jyb.getLzzt() == 1) {
@@ -160,13 +163,17 @@ public class OrgSyncServiceImpl implements OrgSyncService {
         String name = StringUtils.isBlank(loginName) ? jyb.getJybh() : loginName.trim();
         SysUser existing = userService.selectUserByUserName(name);
         if (existing != null) {
-            // 孤儿账号（账号在、映射丢失）：复用并回填锚点，不重复建号
-            JYB relink = new JYB();
-            relink.setJybh(jyb.getJybh());
-            relink.setYhbh(existing.getUserId());
-            relink.setBmbh(existing.getDeptId() != null ? existing.getDeptId() : deptId);
-            jybMapper.updateById(relink);
-            return existing.getUserId();
+            if (canClaim(jyb, existing)) {
+                // 身份吻合（自动建号备注含教员编号，或昵称=教员姓名）→ 认领并回填锚点
+                JYB relink = new JYB();
+                relink.setJybh(jyb.getJybh());
+                relink.setYhbh(existing.getUserId());
+                relink.setBmbh(existing.getDeptId() != null ? existing.getDeptId() : deptId);
+                jybMapper.updateById(relink);
+                return existing;
+            }
+            // 身份不符：自动改用 原名_2 后缀，由返回的 SysUser.userName 告知调用方
+            name = nextAvailableLoginName(name);
         }
         SysUser user = new SysUser();
         user.setUserName(name);
@@ -190,7 +197,27 @@ public class OrgSyncServiceImpl implements OrgSyncService {
         upd.setYhbh(user.getUserId());
         upd.setBmbh(deptId);
         jybMapper.updateById(upd);
-        return user.getUserId();
+        return user;
+    }
+
+    /** 同名账号能否认领：自动建号的备注含教员编号，或账号昵称与教员姓名一致 */
+    private boolean canClaim(JYB jyb, SysUser existing) {
+        if (existing.getRemark() != null && existing.getRemark().contains(jyb.getJybh())) {
+            return true;
+        }
+        return StringUtils.isNotBlank(jyb.getJyxm())
+                && jyb.getJyxm().equals(existing.getNickName());
+    }
+
+    /** 登录名冲突时自动派生可用名：base_2、base_3…… */
+    private String nextAvailableLoginName(String base) {
+        for (int i = 2; i <= 99; i++) {
+            String candidate = base + "_" + i;
+            if (userService.selectUserByUserName(candidate) == null) {
+                return candidate;
+            }
+        }
+        throw new BusinessException("登录名 " + base + " 冲突且自动后缀已用尽，请手工指定登录名");
     }
 
     @Override
@@ -299,6 +326,8 @@ public class OrgSyncServiceImpl implements OrgSyncService {
             wrapper.in(JYB::getJybh, jybhList);
         }
         List<JYB> list = jybMapper.selectList(wrapper);
+        // 教研室状态缓存，避免逐行回表
+        java.util.Map<String, JYSB> officeCache = new java.util.HashMap<>();
         for (JYB jyb : list) {
             try {
                 if (jyb.getYhbh() != null) {
@@ -312,8 +341,42 @@ public class OrgSyncServiceImpl implements OrgSyncService {
                     result.addSkip(jyb.getJyxm() + "（" + jyb.getJybh() + "）：已离职，不建账号");
                     continue;
                 }
-                Long userId = ensureTeacherUser(jyb, null, null, null);
-                result.addCreate(jyb.getJyxm() + "（" + jyb.getJybh() + "）：新建账号 " + jyb.getJybh() + " #" + userId);
+                // 教研室前置校验：缺失/不存在/停用统一跳过，与 alignDepts 口径一致
+                if (StringUtils.isBlank(jyb.getJysdh())) {
+                    result.addSkip(jyb.getJyxm() + "（" + jyb.getJybh() + "）：缺教研室代号，未建账号");
+                    continue;
+                }
+                JYSB office = officeCache.computeIfAbsent(jyb.getJysdh(),
+                        jysbMapper::selectById);
+                if (office == null) {
+                    result.addSkip(jyb.getJyxm() + "（" + jyb.getJybh() + "）：教研室不存在 " + jyb.getJysdh() + "，未建账号");
+                    continue;
+                }
+                if (office.getTy() != null && office.getTy() == 1) {
+                    result.addSkip(jyb.getJyxm() + "（" + jyb.getJybh() + "）：所属教研室「"
+                            + office.getJysmc() + "」已停用，未建账号");
+                    continue;
+                }
+                // 手机号冲突降级为跳过：教员档案保留，修正/清空号码后可再次对齐
+                if (StringUtils.isNotBlank(jyb.getSjh())) {
+                    SysUser probe = new SysUser();
+                    probe.setPhonenumber(jyb.getSjh());
+                    if (!userService.checkPhoneUnique(probe)) {
+                        result.addSkip(jyb.getJyxm() + "（" + jyb.getJybh() + "）：手机号 "
+                                + jyb.getSjh() + " 已被其它账号占用，请先在教员档案中修改或清空该号码后重新对齐");
+                        continue;
+                    }
+                }
+                SysUser user = ensureTeacherUser(jyb, null, null, null);
+                String actual = user.getUserName();
+                if (jyb.getJybh().equals(actual)) {
+                    result.addCreate(jyb.getJyxm() + "（" + jyb.getJybh() + "）：新建账号 "
+                            + actual + " #" + user.getUserId());
+                } else {
+                    result.addCreate(jyb.getJyxm() + "（" + jyb.getJybh() + "）：登录名 "
+                            + jyb.getJybh() + " 被无关账号占用，已自动改用 " + actual
+                            + " #" + user.getUserId());
+                }
             } catch (Exception e) {
                 result.addFail(jyb.getJyxm() + "（" + jyb.getJybh() + "）：" + e.getMessage());
             }
@@ -333,6 +396,10 @@ public class OrgSyncServiceImpl implements OrgSyncService {
         if (jysb == null) {
             throw new BusinessException("教研室不存在：" + jyb.getJysdh());
         }
+        // 停用教研室不建部门：与 alignDepts 同一口径，必须在降级兜底之前拦截
+        if (jysb.getTy() != null && jysb.getTy() == 1) {
+            throw new BusinessException("教研室「" + jysb.getJysmc() + "」已停用，不创建组织部门");
+        }
         try {
             return ensureOfficeDept(jysb);
         } catch (Exception e) {
diff --git a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/unit/PageQuery.java b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/unit/PageQuery.java
index ea01a2f2a..efdad31d9 100644
--- a/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/unit/PageQuery.java
+++ b/backend/roomroot-jwgl/src/main/java/com/roomroot/jwgl/unit/PageQuery.java
@@ -23,7 +23,7 @@ public class PageQuery extends BaseQuery {
      */
     @NotNull(message = "页码不能为空")
     @Min(value = 1, message = "页码最小为1")
-    private Integer pageNum;
+    private Integer pageNum = 1;
 
     /**
      * 每页记录数，默认20条，最小1条，最大100条
@@ -31,7 +31,7 @@ public class PageQuery extends BaseQuery {
     @NotNull(message = "每页大小不能为空")
     @Min(value = 1, message = "每页最小为1条")
     @Max(value = 100, message = "每页最大为100条")
-    private Integer pageSize;
+    private Integer pageSize = 10;
 
     public PageQuery() {}