diff --git a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application.Contracts/Dtos/OpenAi/ThorChatCompletionsRequest.cs b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application.Contracts/Dtos/OpenAi/ThorChatCompletionsRequest.cs
index a3fb0c2c..390018dd 100644
--- a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application.Contracts/Dtos/OpenAi/ThorChatCompletionsRequest.cs
+++ b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application.Contracts/Dtos/OpenAi/ThorChatCompletionsRequest.cs
@@ -13,9 +13,8 @@ public class ThorChatCompletionsRequest
     {
         Messages = new List<ThorChatMessage>();
     }
-    
-    [JsonPropertyName("store")]
-    public bool? Store { get; set; }
+
+    [JsonPropertyName("store")] public bool? Store { get; set; }
 
     /// <summary>
     /// 表示对话中支持的模态类型数组。可以为 null。
@@ -26,14 +25,15 @@ public class ThorChatCompletionsRequest
     /// <summary>
     /// 表示对话中的音频请求参数。可以为 null。
     /// </summary>
-    [JsonPropertyName("audio")] public ThorChatAudioRequest? Audio { get; set; }
+    [JsonPropertyName("audio")]
+    public ThorChatAudioRequest? Audio { get; set; }
 
     /// <summary>
     /// 包含迄今为止对话的消息列表
     /// </summary>
     [JsonPropertyName("messages")]
     public List<ThorChatMessage> Messages { get; set; }
-    
+
     /// <summary>
     /// 模型唯一编码值，如 gpt-4，gpt-3.5-turbo,moonshot-v1-8k，看底层具体平台定义
     /// </summary>
@@ -229,18 +229,25 @@ public class ThorChatCompletionsRequest
         {
             if (value is JsonElement jsonElement)
             {
-                if (jsonElement.ValueKind == JsonValueKind.String)
-                {
-                    ToolChoice = new ThorToolChoice
-                    {
-                        Type = jsonElement.GetString()
-                    };
-                }
-                else if (jsonElement.ValueKind == JsonValueKind.Object)
+                // if (jsonElement.ValueKind == JsonValueKind.String)
+                // {
+                //     ToolChoice = new ThorToolChoice
+                //     {
+                //         Type = jsonElement.GetString()
+                //     };
+                // }
+                if (jsonElement.ValueKind == JsonValueKind.Object)
                 {
                     ToolChoice = jsonElement.Deserialize<ThorToolChoice>();
                 }
             }
+            else if (value is string text)
+            {
+                ToolChoice = new ThorToolChoice
+                {
+                    Type = text
+                };
+            }
             else
             {
                 ToolChoice = (ThorToolChoice)value;
diff --git a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/Chat/MessageAggregateRoot.cs b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/Chat/MessageAggregateRoot.cs
index ddeef24a..40d9575c 100644
--- a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/Chat/MessageAggregateRoot.cs
+++ b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/Chat/MessageAggregateRoot.cs
@@ -44,7 +44,7 @@ public class MessageAggregateRoot : FullAuditedAggregateRoot<Guid>
     public Guid? SessionId { get; set; }
 
     [SugarColumn(ColumnDataType = StaticConfig.CodeFirst_BigString)]
-    public string Content { get; set; }
+    public string? Content { get; set; }
 
     public string Role { get; set; }
     public string ModelId { get; set; }
diff --git a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs
index 8c3962f9..77281aad 100644
--- a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs
+++ b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiGateWayManager.cs
@@ -83,7 +83,7 @@ public class AiGateWayManager : DomainService
         var modelDescribe = await GetModelAsync(request.Model);
         var chatService =
             LazyServiceProvider.GetRequiredKeyedService<IChatCompletionService>(modelDescribe.HandlerName);
-        
+
         await foreach (var result in chatService.CompleteChatStreamAsync(modelDescribe, request, cancellationToken))
         {
             yield return result;
@@ -109,8 +109,7 @@ public class AiGateWayManager : DomainService
         _specialCompatible.Compatible(request);
         var response = httpContext.Response;
         // 设置响应头，声明是 json
-        response.ContentType = "application/json; charset=UTF-8";
-        await using var writer = new StreamWriter(response.Body, Encoding.UTF8, leaveOpen: true);
+        //response.ContentType = "application/json; charset=UTF-8";
         var modelDescribe = await GetModelAsync(request.Model);
         var chatService =
             LazyServiceProvider.GetRequiredKeyedService<IChatCompletionService>(modelDescribe.HandlerName);
@@ -136,13 +135,8 @@ public class AiGateWayManager : DomainService
             await _usageStatisticsManager.SetUsageAsync(userId.Value, request.Model, data.Usage.InputTokens ?? 0,
                 data.Usage.OutputTokens ?? 0);
         }
-
-        var body = JsonConvert.SerializeObject(data, new JsonSerializerSettings
-        {
-            ContractResolver = new CamelCasePropertyNamesContractResolver()
-        });
-        await writer.WriteLineAsync(body);
-        await writer.FlushAsync(cancellationToken);
+        
+        await response.WriteAsJsonAsync(data, cancellationToken);
     }
 
     /// <summary>