diff --git a/apps/applications/api/application.py b/apps/applications/api/application.py
index 49fc71664..b2e73c1e5 100644
--- a/apps/applications/api/application.py
+++ b/apps/applications/api/application.py
@@ -41,16 +41,17 @@ class ApplicationViewSet(OrgBulkModelViewSet):
         if self.action in [
             'create', 'update', 'partial_update', 'bulk_update', 'partial_bulk_update'
         ] and not app_type:
-            # action: create / update ...
+            # action: create / update
             raise JMSException(
                 'The `{}` action must take the `type` query parameter'.format(self.action)
             )
 
         if app_type:
+            # action: create / update / list / retrieve / metadata
             attrs_cls = models.Category.get_type_serializer_cls(app_type)
         elif app_category:
             # action: list / retrieve / metadata
             attrs_cls = models.Category.get_category_serializer_cls(app_category)
         else:
-            attrs_cls = serializers.CommonCategorySerializer
+            attrs_cls = models.Category.get_no_password_serializer_cls()
         return type('ApplicationDynamicSerializer', (serializer_class,), {'attrs': attrs_cls()})
diff --git a/apps/applications/api/mixin.py b/apps/applications/api/mixin.py
index eb4fc9486..98ec99092 100644
--- a/apps/applications/api/mixin.py
+++ b/apps/applications/api/mixin.py
@@ -39,11 +39,11 @@ class SerializeApplicationToTreeNodeMixin:
             'meta': {'type': 'k8s_app'}
         }
 
-    def dispatch_serialize(self, application):
+    def _serialize(self, application):
         method_name = f'_serialize_{application.category}'
         data = getattr(self, method_name)(application)
         return data
 
     def serialize_applications(self, applications):
-        data = [self.dispatch_serialize(application) for application in applications]
+        data = [self._serialize(application) for application in applications]
         return data
diff --git a/apps/applications/api/remote_app.py b/apps/applications/api/remote_app.py
index 45e5c097c..9b983449b 100644
--- a/apps/applications/api/remote_app.py
+++ b/apps/applications/api/remote_app.py
@@ -27,8 +27,14 @@ class RemoteAppConnectionInfoApi(generics.RetrieveAPIView):
     permission_classes = (IsAppUser, )
     serializer_class = RemoteAppConnectionInfoSerializer
 
+    @staticmethod
+    def check_category_allowed(obj):
+        if not obj.category_is_remote_app:
+            raise JMSException(
+                'The request instance(`{}`) is not of category `remote_app`'.format(obj.category)
+            )
+
     def get_object(self):
         obj = super().get_object()
-        if not models.Category.is_remote_app(obj.category):
-            raise JMSException('The request instance is not of category `remote_app`')
+        self.check_category_allowed(obj)
         return obj
diff --git a/apps/applications/models/application.py b/apps/applications/models/application.py
index 43f6e9a99..fb0812858 100644
--- a/apps/applications/models/application.py
+++ b/apps/applications/models/application.py
@@ -102,9 +102,9 @@ class Category(ChoiceSet):
     def get_category_serializer_mapper(cls):
         from ..serializers import remote_app, database_app, k8s_app
         return {
-            cls.db: database_app.DatabaseCategorySerializer,
-            cls.remote_app: remote_app.RemmoteAppCategorySerializer,
-            cls.cloud: k8s_app.CloudCategorySerializer,
+            cls.db: database_app.DBAttrsSerializer,
+            cls.remote_app: remote_app.RemoteAppAttrsSerializer,
+            cls.cloud: k8s_app.CloudAttrsSerializer,
         }
 
     @classmethod
@@ -113,8 +113,9 @@ class Category(ChoiceSet):
         return mapper.get(cg, None)
 
     @classmethod
-    def is_remote_app(cls, cg):
-        return cg == cls.remote_app
+    def get_no_password_serializer_cls(cls):
+        from ..serializers import common
+        return common.NoPasswordSerializer
 
 
 class Application(CommonModelMixin, OrgModelMixin):
@@ -136,3 +137,6 @@ class Application(CommonModelMixin, OrgModelMixin):
         category_display = self.get_category_display()
         type_display = self.get_type_display()
         return f'{self.name}({type_display})[{category_display}]'
+
+    def category_is_remote_app(self):
+        return self.category == Category.remote_app
diff --git a/apps/applications/serializers/common.py b/apps/applications/serializers/common.py
index 07a67551d..31c0ba2ac 100644
--- a/apps/applications/serializers/common.py
+++ b/apps/applications/serializers/common.py
@@ -1,7 +1,7 @@
 from rest_framework import serializers
 
 
-class CommonCategorySerializer(serializers.JSONField):
+class NoPasswordSerializer(serializers.JSONField):
     def to_representation(self, value):
         new_value = {}
         for k, v in value.items():
diff --git a/apps/applications/serializers/database_app.py b/apps/applications/serializers/database_app.py
index 4f9df2e6d..84e4ee2c2 100644
--- a/apps/applications/serializers/database_app.py
+++ b/apps/applications/serializers/database_app.py
@@ -9,7 +9,7 @@ from common.serializers import AdaptedBulkListSerializer
 from .. import models
 
 
-class DatabaseCategorySerializer(serializers.Serializer):
+class DBAttrsSerializer(serializers.Serializer):
     host = serializers.CharField(max_length=128, label=_('Host'))
     port = serializers.IntegerField(label=_('Port'))
     database = serializers.CharField(
@@ -17,19 +17,15 @@ class DatabaseCategorySerializer(serializers.Serializer):
     )
 
 
-class DatabaseAttrsSerializer(DatabaseCategorySerializer):
-    pass
-
-
-class MySQLAttrsSerializer(DatabaseAttrsSerializer):
+class MySQLAttrsSerializer(DBAttrsSerializer):
     port = serializers.IntegerField(default=3306, label=_('Port'))
 
 
-class PostgreAttrsSerializer(DatabaseAttrsSerializer):
+class PostgreAttrsSerializer(DBAttrsSerializer):
     port = serializers.IntegerField(default=5432, label=_('Port'))
 
 
-class OracleAttrsSerializer(DatabaseAttrsSerializer):
+class OracleAttrsSerializer(DBAttrsSerializer):
     port = serializers.IntegerField(default=1521, label=_('Port'))
 
 
diff --git a/apps/applications/serializers/k8s_app.py b/apps/applications/serializers/k8s_app.py
index bd5bbbbe2..bf05903dc 100644
--- a/apps/applications/serializers/k8s_app.py
+++ b/apps/applications/serializers/k8s_app.py
@@ -5,11 +5,11 @@ from orgs.mixins.serializers import BulkOrgResourceModelSerializer
 from .. import models
 
 
-class CloudCategorySerializer(serializers.Serializer):
+class CloudAttrsSerializer(serializers.Serializer):
     cluster = serializers.CharField(max_length=1024, label=_('Cluster'))
 
 
-class K8sAttrsSerializer(CloudCategorySerializer):
+class K8sAttrsSerializer(CloudAttrsSerializer):
     pass
 
 
diff --git a/apps/applications/serializers/remote_app.py b/apps/applications/serializers/remote_app.py
index d1304cd4b..81a18caec 100644
--- a/apps/applications/serializers/remote_app.py
+++ b/apps/applications/serializers/remote_app.py
@@ -14,11 +14,8 @@ from .. import const
 from ..models import RemoteApp, Category, Application
 
 
-class RemmoteAppCategorySerializer(serializers.Serializer):
+class RemoteAppAttrsSerializer(serializers.Serializer):
     asset = serializers.CharField(max_length=36, label=_('Assets'))
-
-
-class RemoteAppAttrsSerializer(RemmoteAppCategorySerializer):
     path = serializers.CharField(max_length=128, label=_('Remote App path'))
 
 
diff --git a/apps/assets/models/user.py b/apps/assets/models/user.py
index add83e2ad..1dfd79ad2 100644
--- a/apps/assets/models/user.py
+++ b/apps/assets/models/user.py
@@ -141,14 +141,14 @@ class SystemUser(BaseUser):
         ]
 
     @property
-    def k8s_application_protocols(self):
+    def cloud_application_protocols(self):
         return [self.PROTOCOL_K8S]
 
     @property
     def application_category_protocols(self):
         protocols = []
         protocols.extend(self.db_application_protocols)
-        protocols.extend(self.k8s_application_protocols)
+        protocols.extend(self.cloud_application_protocols)
         return protocols
 
     def is_need_push(self):
diff --git a/apps/perms/api/application/__init__.py b/apps/perms/api/application/__init__.py
index 5741ddc92..05e4ff6d2 100644
--- a/apps/perms/api/application/__init__.py
+++ b/apps/perms/api/application/__init__.py
@@ -1,4 +1,4 @@
 from .user_permission import *
 from .application_permission import *
 from .application_permission_relation import *
-from .user_group_permission_application import *
+from .user_group_permission import *
diff --git a/apps/perms/api/application/user_group_permission_application.py b/apps/perms/api/application/user_group_permission.py
similarity index 100%
rename from apps/perms/api/application/user_group_permission_application.py
rename to apps/perms/api/application/user_group_permission.py