diff --git a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application/Services/AiChatService.cs b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application/Services/AiChatService.cs
index be8e1dce..a33a9ccc 100644
--- a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application/Services/AiChatService.cs
+++ b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Application/Services/AiChatService.cs
@@ -94,7 +94,7 @@ public class AiChatService : ApplicationService
     /// <param name="input"></param>
     /// <param name="sessionId"></param>
     /// <param name="cancellationToken"></param>
-    public async Task PostSendAsync([FromBody] ThorChatCompletionsRequest input, [FromRoute] Guid sessionId,
+    public async Task PostSendAsync([FromBody] ThorChatCompletionsRequest input, [FromRoute] Guid? sessionId,
         CancellationToken cancellationToken)
     {
         //除了免费模型，其他的模型都要校验
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 752621b4..5d863c1b 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
@@ -19,7 +19,7 @@ public class MessageAggregateRoot : FullAuditedAggregateRoot<Guid>
     {
     }
 
-    public MessageAggregateRoot(Guid userId, Guid? sessionId, string content, string role, string modelId,
+    public MessageAggregateRoot(Guid? userId, Guid? sessionId, string content, string role, string modelId,
         ThorUsageResponse? tokenUsage)
     {
         UserId = userId;
@@ -48,7 +48,7 @@ public class MessageAggregateRoot : FullAuditedAggregateRoot<Guid>
         this.MessageType = sessionId is null ? MessageTypeEnum.Api : MessageTypeEnum.Web;
     }
 
-    public Guid UserId { get; set; }
+    public Guid? UserId { get; set; }
     public Guid? SessionId { get; set; }
 
     [SugarColumn(ColumnDataType = StaticConfig.CodeFirst_BigString)]
diff --git a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/UsageStatisticsAggregateRoot.cs b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/UsageStatisticsAggregateRoot.cs
index ad0ad586..6f9e6aa3 100644
--- a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/UsageStatisticsAggregateRoot.cs
+++ b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Entities/UsageStatisticsAggregateRoot.cs
@@ -13,7 +13,7 @@ public class UsageStatisticsAggregateRoot : FullAuditedAggregateRoot<Guid>
     {
     }
 
-    public UsageStatisticsAggregateRoot(Guid userId, string modelId)
+    public UsageStatisticsAggregateRoot(Guid? userId, string modelId)
     {
         UserId = userId;
         ModelId = modelId;
@@ -22,7 +22,7 @@ public class UsageStatisticsAggregateRoot : FullAuditedAggregateRoot<Guid>
     /// <summary>
     /// 用户id
     /// </summary>
-    public Guid UserId { get; set; }
+    public Guid? UserId { get; set; }
 
     /// <summary>
     /// 哪个模型
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 4f9c3425..70f47354 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
@@ -242,25 +242,23 @@ public class AiGateWayManager : DomainService
 
         await outputTask;
 
-        if (userId is not null)
-        {
-            await _aiMessageManager.CreateUserMessageAsync(userId.Value, sessionId,
-                new MessageInputDto
-                {
-                    Content = request.Messages?.LastOrDefault()?.Content ?? string.Empty,
-                    ModelId = request.Model,
-                    TokenUsage = tokenUsage,
-                });
 
-            await _aiMessageManager.CreateSystemMessageAsync(userId.Value, sessionId,
-                new MessageInputDto
-                {
-                    Content = backupSystemContent.ToString(),
-                    ModelId = request.Model,
-                    TokenUsage = tokenUsage
-                });
+        await _aiMessageManager.CreateUserMessageAsync(userId, sessionId,
+            new MessageInputDto
+            {
+                Content = request.Messages?.LastOrDefault()?.Content ?? string.Empty,
+                ModelId = request.Model,
+                TokenUsage = tokenUsage,
+            });
 
-            await _usageStatisticsManager.SetUsageAsync(userId.Value, request.Model, tokenUsage);
-        }
+        await _aiMessageManager.CreateSystemMessageAsync(userId, sessionId,
+            new MessageInputDto
+            {
+                Content = backupSystemContent.ToString(),
+                ModelId = request.Model,
+                TokenUsage = tokenUsage
+            });
+
+        await _usageStatisticsManager.SetUsageAsync(userId, request.Model, tokenUsage);
     }
 }
\ No newline at end of file
diff --git a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiMessageManager.cs b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiMessageManager.cs
index 38c14605..df8e7586 100644
--- a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiMessageManager.cs
+++ b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/AiMessageManager.cs
@@ -23,7 +23,7 @@ public class AiMessageManager : DomainService
     /// <param name="userId"></param>
     /// <param name="input"></param>
     /// <returns></returns>
-    public async Task CreateSystemMessageAsync(Guid userId, Guid? sessionId, MessageInputDto input)
+    public async Task CreateSystemMessageAsync(Guid? userId, Guid? sessionId, MessageInputDto input)
     {
         input.Role = "system";
         var message = new MessageAggregateRoot(userId, sessionId, input.Content, input.Role, input.ModelId,input.TokenUsage);
@@ -37,7 +37,7 @@ public class AiMessageManager : DomainService
     /// <param name="userId"></param>
     /// <param name="input"></param>
     /// <returns></returns>
-    public async Task CreateUserMessageAsync(Guid userId, Guid? sessionId, MessageInputDto input)
+    public async Task CreateUserMessageAsync(Guid? userId, Guid? sessionId, MessageInputDto input)
     {
         input.Role = "user";
         var message = new MessageAggregateRoot(userId, sessionId, input.Content, input.Role, input.ModelId,input.TokenUsage);
diff --git a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/UsageStatisticsManager.cs b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/UsageStatisticsManager.cs
index 66ae6f65..ef6613c3 100644
--- a/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/UsageStatisticsManager.cs
+++ b/Yi.Abp.Net8/module/ai-hub/Yi.Framework.AiHub.Domain/Managers/UsageStatisticsManager.cs
@@ -18,7 +18,7 @@ public class UsageStatisticsManager : DomainService
     private IDistributedLockProvider DistributedLock =>
         LazyServiceProvider.LazyGetRequiredService<IDistributedLockProvider>();
 
-    public async Task SetUsageAsync(Guid userId, string modelId, ThorUsageResponse? tokenUsage)
+    public async Task SetUsageAsync(Guid? userId, string modelId, ThorUsageResponse? tokenUsage)
     {
         long inputTokenCount = tokenUsage?.PromptTokens
                                ?? tokenUsage.InputTokens
@@ -28,7 +28,7 @@ public class UsageStatisticsManager : DomainService
                                 ?? tokenUsage.OutputTokens
                                 ?? 0;
 
-        await using (await DistributedLock.AcquireLockAsync($"UsageStatistics:{userId.ToString()}"))
+        await using (await DistributedLock.AcquireLockAsync($"UsageStatistics:{userId?.ToString()}"))
         {
             var entity = await _repository._DbQueryable.FirstAsync(x => x.UserId == userId && x.ModelId == modelId);
             //存在数据，更细