diff --git a/src/DotNetCore.CAP/Internal/IConsumerInvoker.Default.cs b/src/DotNetCore.CAP/Internal/IConsumerInvoker.Default.cs
index 646ca33..6692959 100644
--- a/src/DotNetCore.CAP/Internal/IConsumerInvoker.Default.cs
+++ b/src/DotNetCore.CAP/Internal/IConsumerInvoker.Default.cs
@@ -47,7 +47,7 @@ namespace DotNetCore.CAP.Internal
 
                 object result;
                 if (_executor.MethodParameters.Length > 0)
-                    result = await ExecuteWithParameterAsync(obj, message.Content.ToString());
+                    result = await ExecuteWithParameterAsync(obj, message.Content);
                 else
                     result = await ExecuteAsync(obj);
 
@@ -89,23 +89,27 @@ namespace DotNetCore.CAP.Internal
 
         private async Task SentCallbackMessage(string messageId, string topicName, object bodyObj)
         {
-            var callbackMessage = new CapMessageDto
-            {
-                Id = messageId,
-                Content = bodyObj
-            };
-
             using (var scope = _serviceProvider.CreateScope())
             {
                 var provider = scope.ServiceProvider;
                 var publisher = provider.GetRequiredService<ICallbackPublisher>();
+                var serializer = provider.GetService<IContentSerializer>();
+                var packer = provider.GetService<IMessagePacker>();
+
+                var callbackMessage = new CapMessageDto
+                {
+                    Id = messageId,
+                    Content = serializer.Serialize(bodyObj)
+                };
+                var content = packer.Pack(callbackMessage);
 
                 var publishedMessage = new CapPublishedMessage
                 {
                     Name = topicName,
-                    Content = Helper.ToJson(callbackMessage),
+                    Content = content,
                     StatusName = StatusName.Scheduled
                 };
+
                 await publisher.PublishAsync(publishedMessage);
             }
         }
diff --git a/src/DotNetCore.CAP/Internal/IContentSerializer.Json.cs b/src/DotNetCore.CAP/Internal/IContentSerializer.Json.cs
index 2726cd6..c4fe3ee 100644
--- a/src/DotNetCore.CAP/Internal/IContentSerializer.Json.cs
+++ b/src/DotNetCore.CAP/Internal/IContentSerializer.Json.cs
@@ -6,12 +6,12 @@ namespace DotNetCore.CAP.Internal
 {
     public class JsonContentSerializer : IContentSerializer
     {
-        public T DeSerialize<T>(string messageObjStr) where T : CapMessageDto, new()
+        public T DeSerialize<T>(string messageObjStr) 
         {
             return Helper.FromJson<T>(messageObjStr);
         }
 
-        public string Serialize<T>(T messageObj) where T : CapMessageDto, new()
+        public string Serialize<T>(T messageObj)
         {
             return Helper.ToJson(messageObj);
         }
diff --git a/src/DotNetCore.CAP/Internal/IMessagePacker.Default.cs b/src/DotNetCore.CAP/Internal/IMessagePacker.Default.cs
new file mode 100644
index 0000000..1f7e976
--- /dev/null
+++ b/src/DotNetCore.CAP/Internal/IMessagePacker.Default.cs
@@ -0,0 +1,25 @@
+using DotNetCore.CAP.Abstractions;
+using DotNetCore.CAP.Models;
+
+namespace DotNetCore.CAP.Internal
+{
+    public class DefaultMessagePacker : IMessagePacker
+    {
+        private readonly IContentSerializer _serializer;
+
+        public DefaultMessagePacker(IContentSerializer serializer)
+        {
+            _serializer = serializer;
+        }
+
+        public string Pack(CapMessage obj)
+        {
+            return _serializer.Serialize(obj);
+        }
+
+        public CapMessage UnPack(string packingMessage)
+        {
+            return _serializer.DeSerialize<CapMessageDto>(packingMessage);
+        }
+    }
+}