diff --git a/apps/applications/migrations/0022_auto_20220714_1046.py b/apps/applications/migrations/0022_auto_20220714_1046.py
new file mode 100644
index 000000000..8ecb1cbe6
--- /dev/null
+++ b/apps/applications/migrations/0022_auto_20220714_1046.py
@@ -0,0 +1,23 @@
+# Generated by Django 3.2.12 on 2022-07-14 02:46
+
+from django.db import migrations
+
+
+def migrate_db_oracle_version_to_attrs(apps, schema_editor):
+    db_alias = schema_editor.connection.alias
+    model = apps.get_model("applications", "Application")
+    oracles = list(model.objects.using(db_alias).filter(type='oracle'))
+    for o in oracles:
+        o.attrs['version'] = '12c'
+    model.objects.using(db_alias).bulk_update(oracles, ['attrs'])
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('applications', '0021_auto_20220629_1826'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_db_oracle_version_to_attrs)
+    ]
diff --git a/apps/applications/models/application.py b/apps/applications/models/application.py
index 1644ab1d5..cc98abaf8 100644
--- a/apps/applications/models/application.py
+++ b/apps/applications/models/application.py
@@ -308,7 +308,7 @@ class Application(CommonModelMixin, OrgModelMixin, ApplicationTreeNodeMixin):
         """ Oracle 类型需要单独处理，因为要携带版本号 """
         if not self.is_type(self.APP_TYPE.oracle):
             return
-        version = self.attrs.get('version', OracleVersion.version_other)
+        version = self.attrs.get('version', OracleVersion.version_12c)
         if version == OracleVersion.version_other:
             return
         return 'oracle_%s' % version
diff --git a/apps/applications/serializers/attrs/application_type/oracle.py b/apps/applications/serializers/attrs/application_type/oracle.py
index 94cfaa319..fdc8016d2 100644
--- a/apps/applications/serializers/attrs/application_type/oracle.py
+++ b/apps/applications/serializers/attrs/application_type/oracle.py
@@ -9,7 +9,7 @@ __all__ = ['OracleSerializer']
 
 class OracleSerializer(DBSerializer):
     version = serializers.ChoiceField(
-        choices=OracleVersion.choices, default=OracleVersion.version_other,
+        choices=OracleVersion.choices, default=OracleVersion.version_12c,
         allow_null=True, label=_('Version'),
         help_text=_('Magnus currently supports only 11g and 12c connections')
     )