diff --git a/apps/orgs/signals_handler/common.py b/apps/orgs/signals_handler/common.py
index fb8b2a2d1..942c82cbb 100644
--- a/apps/orgs/signals_handler/common.py
+++ b/apps/orgs/signals_handler/common.py
@@ -15,6 +15,7 @@ from orgs.hands import set_current_org, Node, get_current_org
 from perms.models import (AssetPermission, ApplicationPermission)
 from users.models import UserGroup, User
 from common.const.signals import PRE_REMOVE, POST_REMOVE
+from common.decorator import on_transaction_commit
 from common.signals import django_ready
 from common.utils import get_logger
 from common.utils.connection import RedisPubSub
@@ -167,3 +168,13 @@ def on_org_user_changed(action, instance, reverse, pk_set, **kwargs):
 
             leaved_users = set(pk_set) - set(org.members.filter(id__in=user_pk_set).values_list('id', flat=True))
             _clear_users_from_org(org, leaved_users)
+
+
+@receiver(post_save, sender=User)
+@on_transaction_commit
+def on_user_created_set_default_org(sender, instance, created, **kwargs):
+    if not created:
+        return
+    if instance.orgs.count() > 0:
+        return
+    Organization.default().members.add(instance)
diff --git a/apps/settings/utils/ldap.py b/apps/settings/utils/ldap.py
index 6eeab1daa..0cac92a4c 100644
--- a/apps/settings/utils/ldap.py
+++ b/apps/settings/utils/ldap.py
@@ -365,17 +365,12 @@ class LDAPImportUtil(object):
     def perform_import(self, users):
         logger.info('Start perform import ldap users, count: {}'.format(len(users)))
         errors = []
-        instances = []
         for user in users:
             try:
-                obj, created = self.update_or_create(user)
-                if created:
-                    instances.append(obj)
+                self.update_or_create(user)
             except Exception as e:
                 errors.append({user['username']: str(e)})
                 logger.error(e)
-        # 默认添加用户到 Default 组织
-        Organization.default().members.add(*instances)
         logger.info('End perform import ldap users')
         return errors
 
diff --git a/utils/migrate_unorg_users_to_default_org.sh b/utils/migrate_unorg_users_to_default_org.sh
new file mode 100644
index 000000000..e26ca7525
--- /dev/null
+++ b/utils/migrate_unorg_users_to_default_org.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+#
+
+python ../apps/manage.py shell << EOF
+from users.models import User
+from orgs.models import Organization
+unorgs_users = [user for user in User.objects.all() if user.orgs.count() == 0]
+Organization.default().members.add(*unorgs_users)
+EOF