diff --git a/features/udm_user/repo/repo_udm_auth_user.go b/features/udm_user/repo/repo_udm_auth_user.go
index 1f0c63fa..461b2130 100644
--- a/features/udm_user/repo/repo_udm_auth_user.go
+++ b/features/udm_user/repo/repo_udm_auth_user.go
@@ -102,8 +102,8 @@ func (r *RepoUdmAuthUser) SelectPage(query map[string]any) map[string]any {
 		if v == "imsi" {
 			sortSql += " order by imsi "
 		}
-		if v, ok := query["sortOrder"]; ok && v != nil {
-			if v == "desc" {
+		if o, ok := query["sortOrder"]; ok && o != nil && v != "" {
+			if o == "desc" {
 				sortSql += " desc "
 			} else {
 				sortSql += " asc "
diff --git a/features/udm_user/repo/repo_udm_sub_user.go b/features/udm_user/repo/repo_udm_sub_user.go
index d7f5ead9..93a59bc8 100644
--- a/features/udm_user/repo/repo_udm_sub_user.go
+++ b/features/udm_user/repo/repo_udm_sub_user.go
@@ -120,8 +120,11 @@ func (r *RepoUdmSubUser) SelectPage(query map[string]any) map[string]any {
 		if v == "imsi" {
 			sortSql += " order by imsi "
 		}
-		if v, ok := query["sortOrder"]; ok && v != nil {
-			if v == "desc" {
+		if v == "msisdn" {
+			sortSql += " order by msisdn "
+		}
+		if o, ok := query["sortOrder"]; ok && o != nil && v != "" {
+			if o == "desc" {
 				sortSql += " desc "
 			} else {
 				sortSql += " asc "