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 f7382827..d4c89dc2 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
@@ -793,12 +793,13 @@ public class OaUserListSyncHelper {
 			.map(UserDept::getId)
 			.filter(Objects::nonNull)
 			.collect(Collectors.toSet());
-		Set<Long> reboundUserIds = userDeptList.stream()
-			.map(UserDept::getUserId)
+		// 本批已同步人员都要对齐部门：即使 findDept 失败没绑上新部门，也必须清掉历史脏关系，
+		// 否则会继续挂在运输事业部「运营管理部」等旧部门下被列表查出来。
+		Set<Long> syncedUserIds = userMap.values().stream()
 			.filter(Objects::nonNull)
 			.collect(Collectors.toSet());
 		List<Long> staleUserDeptIds = existingUserDeptList.stream()
-			.filter(userDept -> userDept.getId() != null && reboundUserIds.contains(userDept.getUserId()))
+			.filter(userDept -> userDept.getId() != null && syncedUserIds.contains(userDept.getUserId()))
 			.map(UserDept::getId)
 			.filter(userDeptId -> !currentUserDeptIds.contains(userDeptId))
 			.toList();
@@ -825,6 +826,10 @@ public class OaUserListSyncHelper {
 		}
 		Collection<Long> userIds = userMap.values();
 		List<UserDeptIdsVO> list = userDeptService.queryUserDeptIds(userIds);
+		Set<Long> usersWithDept = list.stream()
+			.map(UserDeptIdsVO::getUserId)
+			.filter(Objects::nonNull)
+			.collect(Collectors.toSet());
 		Set<Long> noRoleUserIds = userService.list(Wrappers.<User>lambdaQuery()
 				.in(User::getId, userIds)
 				.and(wrapper -> wrapper.isNull(User::getRoleId)
@@ -834,31 +839,42 @@ public class OaUserListSyncHelper {
 			.map(User::getId)
 			.collect(Collectors.toSet());
 		String defaultRoleId = getDefaultRoleId();
-		List<User> updateUserParams = list.stream()
-			.filter(userDeptIds -> {
-				if (StringUtils.isBlank(userDeptIds.getDeptIds())) {
-					return false;
-				}
-				int deptIdLength = userDeptIds.getDeptIds().length();
-				int deptCodesLength = StringUtils.length(userDeptIds.getDeptCodes());
-				if (deptIdLength > MAX_DEPT_ID_LENGTH || deptCodesLength > MAX_DEPT_ID_LENGTH) {
-					ComposeLogUtil.getLastLog().warn(
-						"用户部门字段超长已跳过回写 userId={} deptIdLen={} deptCodesLen={} max={}",
-						userDeptIds.getUserId(), deptIdLength, deptCodesLength, MAX_DEPT_ID_LENGTH);
-					return false;
-				}
-				return true;
-			})
-			.map(userDeptIds -> {
-				User user = new User();
-				user.setId(userDeptIds.getUserId());
-				user.setDeptId(userDeptIds.getDeptIds());
-				user.setDeptCodes(userDeptIds.getDeptCodes());
-				if (noRoleUserIds.contains(userDeptIds.getUserId())) {
-					user.setRoleId(defaultRoleId);
-				}
-				return user;
-			}).toList();
+		List<User> updateUserParams = new ArrayList<>();
+		for (UserDeptIdsVO userDeptIds : list) {
+			if (userDeptIds.getUserId() == null || StringUtils.isBlank(userDeptIds.getDeptIds())) {
+				continue;
+			}
+			int deptIdLength = userDeptIds.getDeptIds().length();
+			int deptCodesLength = StringUtils.length(userDeptIds.getDeptCodes());
+			if (deptIdLength > MAX_DEPT_ID_LENGTH || deptCodesLength > MAX_DEPT_ID_LENGTH) {
+				ComposeLogUtil.getLastLog().warn(
+					"用户部门字段超长已跳过回写 userId={} deptIdLen={} deptCodesLen={} max={}",
+					userDeptIds.getUserId(), deptIdLength, deptCodesLength, MAX_DEPT_ID_LENGTH);
+				continue;
+			}
+			User user = new User();
+			user.setId(userDeptIds.getUserId());
+			user.setDeptId(userDeptIds.getDeptIds());
+			user.setDeptCodes(userDeptIds.getDeptCodes());
+			if (noRoleUserIds.contains(userDeptIds.getUserId())) {
+				user.setRoleId(defaultRoleId);
+			}
+			updateUserParams.add(user);
+		}
+		// 本批已同步但已无任何部门关系的人员，清空 blade_user 上残留的 dept_id/dept_codes
+		for (Long userId : syncedUserIds) {
+			if (usersWithDept.contains(userId)) {
+				continue;
+			}
+			User user = new User();
+			user.setId(userId);
+			user.setDeptId("");
+			user.setDeptCodes("");
+			if (noRoleUserIds.contains(userId)) {
+				user.setRoleId(defaultRoleId);
+			}
+			updateUserParams.add(user);
+		}
 		if (CollectionUtil.isNotEmpty(updateUserParams)) {
 			userService.updateBatchById(updateUserParams);
 		}