diff --git a/blade-service/blade-system/src/main/java/org/springblade/system/convert/UserConvert.java b/blade-service/blade-system/src/main/java/org/springblade/system/convert/UserConvert.java
index abf59acf..2dabbf04 100644
--- a/blade-service/blade-system/src/main/java/org/springblade/system/convert/UserConvert.java
+++ b/blade-service/blade-system/src/main/java/org/springblade/system/convert/UserConvert.java
@@ -148,7 +148,7 @@ public interface UserConvert {
     /**
      *  oa人员转本系统用户部门
      * @param person
-     * @param userMap 所有用户手机号与id map
+     * @param userMap OA登录名与用户id
      * @return
      */
     default UserDept person2userDept(OAPersonResponse person, Map<String, Long> userMap) {
@@ -162,8 +162,9 @@ public interface UserConvert {
         userDept.setStatus(status);
         // 排序
         userDept.setSort(OAUtils.parseInt(person.getDsporder()));
-        // 用户id
-        userDept.setUserId(userMap.get(resolveAccount(person)));
+        // 用户id，按 OA 登录名关联本批已新增或更新的用户
+        String oaLoginId = person == null ? null : StringUtils.trimToNull(person.getLoginid());
+        userDept.setUserId(oaLoginId == null ? null : userMap.get(oaLoginId));
         userDept.setSyncTime(new Date());
         return userDept;
     }
diff --git a/blade-service/blade-system/src/main/java/org/springblade/system/service/impl/OaUserListSyncHelper.java b/blade-service/blade-system/src/main/java/org/springblade/system/service/impl/OaUserListSyncHelper.java
index 87e3cd50..46f8af2b 100644
--- a/blade-service/blade-system/src/main/java/org/springblade/system/service/impl/OaUserListSyncHelper.java
+++ b/blade-service/blade-system/src/main/java/org/springblade/system/service/impl/OaUserListSyncHelper.java
@@ -403,70 +403,37 @@ public class OaUserListSyncHelper {
 		Map<String, OAPersonResponse> uniquePersonMap = new LinkedHashMap<>();
 		int skippedCount = 0;
 		for (OAPersonResponse oaPerson : oaPersons) {
-			String account = userConvert.resolveAccount(oaPerson);
-			if (StringUtils.isBlank(account)) {
+			String oaLoginId = resolveOaLoginId(oaPerson);
+			if (StringUtils.isBlank(oaLoginId)) {
 				skippedCount++;
 				continue;
 			}
-			uniquePersonMap.putIfAbsent(account, oaPerson);
+			uniquePersonMap.put(oaLoginId, oaPerson);
 		}
 		if (uniquePersonMap.isEmpty()) {
-			ComposeLogUtil.getLastLog().warn("OA人员均缺少loginid/工号/手机号，跳过人员同步");
+			ComposeLogUtil.getLastLog().warn("OA人员均缺少登录名，跳过人员同步");
 			return new PersonSyncCount(0, skippedCount);
 		}
 		String tenantId = resolveTenantId();
 		String defaultPassword = DigestUtil.encrypt(ParamCache.getValue(DEFAULT_PARAM_PASSWORD));
-		List<User> users = uniquePersonMap.values().stream()
-			.map(person -> {
-				User user = userConvert.person2user(person, defaultPassword);
+		List<User> users = uniquePersonMap.entrySet().stream()
+			.map(entry -> {
+				User user = userConvert.person2user(entry.getValue(), defaultPassword);
 				user.setTenantId(tenantId);
+				user.setOaLoginId(entry.getKey());
+				user.setAccount(entry.getKey());
 				return user;
 			})
 			.toList();
-		List<String> accounts = users.stream()
-			.map(User::getAccount)
-			.filter(StringUtils::isNotBlank)
-			.distinct()
-			.toList();
-		List<String> phones = users.stream()
-			.map(User::getPhone)
-			.filter(StringUtils::isNotBlank)
-			.distinct()
-			.toList();
-		Map<String, User> existingByAccount = new HashMap<>();
-		Map<String, User> existingByPhone = new HashMap<>();
-		userService.list(Wrappers.<User>lambdaQuery()
-				.and(wrapper -> {
-					wrapper.in(User::getAccount, accounts);
-					if (CollectionUtil.isNotEmpty(phones)) {
-						wrapper.or().in(User::getPhone, phones);
-					}
-				})
-			).stream()
-			.peek(userService::decryptPhone)
-			.forEach(user -> {
-				if (StringUtils.isNotBlank(user.getAccount())) {
-					existingByAccount.put(user.getAccount(), user);
-				}
-				if (StringUtils.isNotBlank(user.getPhone())) {
-					existingByPhone.put(user.getPhone(), user);
-				}
-			});
+		Map<String, User> existingByOaLoginId = this.loadUsersByOaLoginId(tenantId, uniquePersonMap.keySet());
 		Map<String, Long> userMap = new HashMap<>();
 		Set<Long> existsUserIds = new HashSet<>();
-		Set<Long> unchangedUserIds = new HashSet<>();
 		users.forEach(user -> {
-			User existingUser = existingByAccount.get(user.getAccount());
-			if (existingUser == null && StringUtils.isNotBlank(user.getPhone())) {
-				existingUser = existingByPhone.get(user.getPhone());
-			}
+			User existingUser = existingByOaLoginId.get(user.getOaLoginId());
 			if (existingUser != null) {
 				user.setId(existingUser.getId());
 				user.setPassword(null);
 				existsUserIds.add(existingUser.getId());
-				if (shouldSkipOaUpdate(existingUser, user)) {
-					unchangedUserIds.add(existingUser.getId());
-				}
 			} else {
 				user.setId(DefaultIdentifierGenerator.getInstance().nextId(null));
 				user.setPostId("-1");
@@ -474,9 +441,9 @@ public class OaUserListSyncHelper {
 				user.setDataScopeRange(1);
 				user.setDataLevelRange(1);
 				user.setIncludeNewCustomer(0);
-				userService.encryptPhone(user);
 			}
-			userMap.put(user.getAccount(), user.getId());
+			userService.encryptPhone(user);
+			userMap.put(user.getOaLoginId(), user.getId());
 		});
 
 		List<User> addUsers = users.stream()
@@ -488,18 +455,13 @@ public class OaUserListSyncHelper {
 		}
 		List<User> updateUsers = users.stream()
 			.filter(user -> existsUserIds.contains(user.getId()))
-			.filter(user -> !unchangedUserIds.contains(user.getId()))
 			.toList();
 		if (CollectionUtil.isNotEmpty(updateUsers)) {
 			ComposeLogUtil.getLastLog().info("批量修改用户：{}", updateUsers.size());
 			userService.updateBatchById(updateUsers);
 		}
-		if (!unchangedUserIds.isEmpty()) {
-			ComposeLogUtil.getLastLog().info("跳过未变更用户：{}", unchangedUserIds.size());
-		}
-		ComposeLogUtil.getLastLog().info("缺少账号已跳过的人员：{}", skippedCount);
+		ComposeLogUtil.getLastLog().info("缺少OA登录名已跳过的人员：{}", skippedCount);
 		int syncedCount = addUsers.size() + updateUsers.size();
-		skippedCount += unchangedUserIds.size();
 		if (userMap.isEmpty()) {
 			return new PersonSyncCount(0, skippedCount);
 		}
@@ -511,11 +473,8 @@ public class OaUserListSyncHelper {
 		Set<Long> existsUserDeptIds = new HashSet<>(userDeptMap.values());
 		List<UserDept> userDeptList = oaPersons.stream()
 			.filter(oaPerson -> {
-				String account = userConvert.resolveAccount(oaPerson);
-				if (!userMap.containsKey(account)) {
-					return false;
-				}
-				return !unchangedUserIds.contains(userMap.get(account));
+				String oaLoginId = resolveOaLoginId(oaPerson);
+				return StringUtils.isNotBlank(oaLoginId) && userMap.containsKey(oaLoginId);
 			})
 			.map(oaPerson -> this.buildUserDept(oaPerson, userMap, orgIndex))
 			.filter(Objects::nonNull)
@@ -554,7 +513,6 @@ public class OaUserListSyncHelper {
 			.collect(Collectors.toSet());
 		String defaultRoleId = getDefaultRoleId();
 		List<User> updateUserParams = list.stream()
-			.filter(userDeptIds -> !unchangedUserIds.contains(userDeptIds.getUserId()))
 			.filter(userDeptIds -> {
 				if (StringUtils.isBlank(userDeptIds.getDeptIds())) {
 					return false;
@@ -586,18 +544,51 @@ public class OaUserListSyncHelper {
 	}
 
 	/**
-	 * oaModified 一致则跳过更新；任一侧为空无法确认一致，执行更新以补齐字段
+	 * 按 OA 登录名加载已有用户。同一登录名有多条时保留较早的一条，后续同步都更新这一条。
 	 */
-	private boolean shouldSkipOaUpdate(User existing, User incoming) {
-		if (existing == null) {
-			return false;
+	private Map<String, User> loadUsersByOaLoginId(String tenantId, Collection<String> oaLoginIds) {
+		Map<String, User> existingByOaLoginId = new HashMap<>();
+		if (CollectionUtil.isEmpty(oaLoginIds)) {
+			return existingByOaLoginId;
 		}
-		String localModified = StringUtils.trimToEmpty(existing.getOaModified());
-		String remoteModified = StringUtils.trimToEmpty(incoming == null ? null : incoming.getOaModified());
-		if (localModified.isEmpty() || remoteModified.isEmpty()) {
-			return false;
+		List<String> oaLoginIdList = oaLoginIds.stream()
+			.filter(StringUtils::isNotBlank)
+			.distinct()
+			.toList();
+		int batchSize = 500;
+		for (int fromIndex = 0; fromIndex < oaLoginIdList.size(); fromIndex += batchSize) {
+			List<String> oaLoginIdBatch = oaLoginIdList.subList(fromIndex, Math.min(fromIndex + batchSize, oaLoginIdList.size()));
+			userService.list(Wrappers.<User>lambdaQuery()
+					.eq(User::getTenantId, tenantId)
+					.in(User::getOaLoginId, oaLoginIdBatch))
+				.forEach(user -> {
+					String oaLoginId = StringUtils.trimToNull(user.getOaLoginId());
+					if (oaLoginId == null) {
+						return;
+					}
+					User previous = existingByOaLoginId.get(oaLoginId);
+					if (previous == null) {
+						existingByOaLoginId.put(oaLoginId, user);
+						return;
+					}
+					if (user.getId() != null && previous.getId() != null && user.getId() < previous.getId()) {
+						ComposeLogUtil.getLastLog().warn("OA登录名重复，保留较早用户 oaLoginId={} keepUserId={} dropUserId={}",
+							oaLoginId, user.getId(), previous.getId());
+						existingByOaLoginId.put(oaLoginId, user);
+						return;
+					}
+					ComposeLogUtil.getLastLog().warn("OA登录名重复，保留较早用户 oaLoginId={} keepUserId={} dropUserId={}",
+						oaLoginId, previous.getId(), user.getId());
+				});
 		}
-		return localModified.equals(remoteModified);
+		return existingByOaLoginId;
+	}
+
+	private String resolveOaLoginId(OAPersonResponse oaPerson) {
+		if (oaPerson == null) {
+			return null;
+		}
+		return StringUtils.trimToNull(oaPerson.getLoginid());
 	}
 
 	private boolean isPersonBypassCode(String deptCode, DeptCategory deptCategory) {
@@ -638,8 +629,8 @@ public class OaUserListSyncHelper {
 		Dept department = orgIndex.findDept(oaPerson);
 		if (department == null || department.getId() == null) {
 			ComposeLogUtil.getLastLog().warn(
-				"人员未匹配到已有部门，请先同步组织架构 account={} departmentid={} departmentname={} subcompanyid1={}",
-				userConvert.resolveAccount(oaPerson), oaPerson.getDepartmentid(), oaPerson.getDepartmentname(),
+				"人员未匹配到已有部门，请先同步组织架构 oaLoginId={} departmentid={} departmentname={} subcompanyid1={}",
+				resolveOaLoginId(oaPerson), oaPerson.getDepartmentid(), oaPerson.getDepartmentname(),
 				oaPerson.getSubcompanyid1());
 			return null;
 		}