diff --git a/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/AuditingContractResolver.cs b/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/AuditingContractResolver.cs
index 0f10652d8d..e6d03bf707 100644
--- a/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/AuditingContractResolver.cs
+++ b/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/AuditingContractResolver.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Reflection;
 using Newtonsoft.Json;
@@ -36,13 +35,5 @@ namespace Volo.Abp.Auditing
 
             return property;
         }
-
-        private static readonly ConcurrentDictionary<List<Type>, AuditingContractResolver> AuditingContractResolverdDictionary = new ConcurrentDictionary<List<Type>, AuditingContractResolver>();
-
-        public static AuditingContractResolver GetSharedAuditingContractResolver(List<Type> ignoredTypes)
-        {
-            return AuditingContractResolverdDictionary.GetOrAdd(ignoredTypes,
-                x => new AuditingContractResolver(ignoredTypes));
-        }
     }
 }
diff --git a/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/JsonNetAuditSerializer.cs b/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/JsonNetAuditSerializer.cs
index 931cdbbfad..6da7ec5da2 100644
--- a/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/JsonNetAuditSerializer.cs
+++ b/framework/src/Volo.Abp.Auditing/Volo/Abp/Auditing/JsonNetAuditSerializer.cs
@@ -1,3 +1,5 @@
+using System;
+using System.Collections.Generic;
 using Microsoft.Extensions.Options;
 using Newtonsoft.Json;
 using Volo.Abp.DependencyInjection;
@@ -18,10 +20,29 @@ namespace Volo.Abp.Auditing
         {
             var options = new JsonSerializerSettings
             {
-                ContractResolver = AuditingContractResolver.GetSharedAuditingContractResolver(Options.IgnoredTypes)
+                ContractResolver = GetSharedAuditingContractResolver(Options.IgnoredTypes)
             };
 
             return JsonConvert.SerializeObject(obj, options);
         }
+
+        private static readonly object SyncObj = new object();
+        private static AuditingContractResolver _sharedAuditingContractResolver;
+
+        public static AuditingContractResolver GetSharedAuditingContractResolver(List<Type> ignoredTypes)
+        {
+            if (_sharedAuditingContractResolver == null)
+            {
+                lock (SyncObj)
+                {
+                    if (_sharedAuditingContractResolver == null)
+                    {
+                        _sharedAuditingContractResolver = new AuditingContractResolver(ignoredTypes);
+                    }
+                }
+            }
+
+            return _sharedAuditingContractResolver;
+        }
     }
 }
\ No newline at end of file