diff --git a/apps/assets/api/asset_user.py b/apps/assets/api/asset_user.py
index b916e43ec..e9c2f1179 100644
--- a/apps/assets/api/asset_user.py
+++ b/apps/assets/api/asset_user.py
@@ -49,7 +49,7 @@ class AssetUserSearchBackend(filters.BaseFilterBackend):
             if field in ("node_id", "system_user_id", "admin_user_id"):
                 continue
             _queryset |= queryset.filter(**{field: value})
-        return _queryset
+        return _queryset.distinct()
 
 
 class AssetUserViewSet(IDInCacheFilterMixin, BulkModelViewSet):
diff --git a/apps/assets/backends/asset_user.py b/apps/assets/backends/asset_user.py
index 774172e6c..e76baf14b 100644
--- a/apps/assets/backends/asset_user.py
+++ b/apps/assets/backends/asset_user.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 #
+from collections import defaultdict
 from .base import BaseBackend
 
 
@@ -23,6 +24,7 @@ class AssetUserBackend(BaseBackend):
             queryset = queryset.filter(username=username)
         if assets:
             queryset = queryset.filter(assets__in=assets).distinct()
+
         queryset = cls.filter_queryset_more(queryset)
         instances = cls.construct_authbook_objects(queryset, assets)
         return instances
@@ -30,10 +32,26 @@ class AssetUserBackend(BaseBackend):
     @classmethod
     def construct_authbook_objects(cls, asset_users, assets):
         instances = []
+        assets_user_assets_map = defaultdict(set)
+        if isinstance(asset_users, list):
+            assets_user_assets_map = {
+                asset_user.id: asset_user.assets.values_list('id', flat=True)
+                for asset_user in asset_users
+            }
+        else:
+            assets_user_assets = asset_users.values_list('id', 'assets')
+            for i, asset_id in assets_user_assets:
+                assets_user_assets_map[i].add(asset_id)
+
         for asset_user in asset_users:
             if not assets:
-                assets = asset_user.assets.all()
-            for asset in assets:
+                related_assets = asset_user.assets.all()
+            else:
+                assets_map = {a.id: a for a in assets}
+                related_assets = [
+                    assets_map.get(i) for i in assets_user_assets_map.get(asset_user.id) if i in assets_map
+                ]
+            for asset in related_assets:
                 instance = asset_user.construct_to_authbook(asset)
                 instance.backend = cls.backend
                 instances.append(instance)
diff --git a/apps/assets/backends/base.py b/apps/assets/backends/base.py
index f45b0b3b8..801bfbbb1 100644
--- a/apps/assets/backends/base.py
+++ b/apps/assets/backends/base.py
@@ -81,6 +81,11 @@ class AssetUserQuerySet(list):
         queryset = self.filter_in(kwargs).filter_equal(kwargs)
         return queryset
 
+    def distinct(self):
+        items = list(set(self))
+        self[:] = items
+        return self
+
     def __or__(self, other):
         self.extend(other)
         return self