diff --git a/framework/src/Volo.Abp.Http/Volo/Abp/Http/Modeling/ApiTypeNameHelper.cs b/framework/src/Volo.Abp.Http/Volo/Abp/Http/Modeling/ApiTypeNameHelper.cs
index 04467712a9..1bdb2ba9ab 100644
--- a/framework/src/Volo.Abp.Http/Volo/Abp/Http/Modeling/ApiTypeNameHelper.cs
+++ b/framework/src/Volo.Abp.Http/Volo/Abp/Http/Modeling/ApiTypeNameHelper.cs
@@ -6,8 +6,6 @@ namespace Volo.Abp.Http.Modeling
 {
     public static class ApiTypeNameHelper
     {
-        private static ITypeList _cycleType = new TypeList();
-
         public static string GetTypeName(Type type)
         {
             if (TypeHelper.IsDictionary(type, out var keyType, out var valueType))