diff --git a/backend/IMTest/bin/Debug/net8.0/IMTest.dll b/backend/IMTest/bin/Debug/net8.0/IMTest.dll
index 698670a..c856d72 100644
Binary files a/backend/IMTest/bin/Debug/net8.0/IMTest.dll and b/backend/IMTest/bin/Debug/net8.0/IMTest.dll differ
diff --git a/backend/IMTest/bin/Debug/net8.0/IMTest.pdb b/backend/IMTest/bin/Debug/net8.0/IMTest.pdb
index 3c5da42..d7f40fa 100644
Binary files a/backend/IMTest/bin/Debug/net8.0/IMTest.pdb and b/backend/IMTest/bin/Debug/net8.0/IMTest.pdb differ
diff --git a/backend/IMTest/bin/Debug/net8.0/IM_API.dll b/backend/IMTest/bin/Debug/net8.0/IM_API.dll
index 76224c5..902d7d7 100644
Binary files a/backend/IMTest/bin/Debug/net8.0/IM_API.dll and b/backend/IMTest/bin/Debug/net8.0/IM_API.dll differ
diff --git a/backend/IMTest/bin/Debug/net8.0/IM_API.exe b/backend/IMTest/bin/Debug/net8.0/IM_API.exe
index 54ffe38..b68e34c 100644
Binary files a/backend/IMTest/bin/Debug/net8.0/IM_API.exe and b/backend/IMTest/bin/Debug/net8.0/IM_API.exe differ
diff --git a/backend/IMTest/bin/Debug/net8.0/IM_API.pdb b/backend/IMTest/bin/Debug/net8.0/IM_API.pdb
index 2acf00a..c8d340a 100644
Binary files a/backend/IMTest/bin/Debug/net8.0/IM_API.pdb and b/backend/IMTest/bin/Debug/net8.0/IM_API.pdb differ
diff --git a/backend/IMTest/obj/Debug/net8.0/IMTest.AssemblyInfo.cs b/backend/IMTest/obj/Debug/net8.0/IMTest.AssemblyInfo.cs
index 68d092d..821e8d2 100644
--- a/backend/IMTest/obj/Debug/net8.0/IMTest.AssemblyInfo.cs
+++ b/backend/IMTest/obj/Debug/net8.0/IMTest.AssemblyInfo.cs
@@ -14,7 +14,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("IMTest")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+2565678b22efd0dc8308f2004d582b518ada0245")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+f42e990c45b8536af0a4b37e4e12a46c917ca02c")]
 [assembly: System.Reflection.AssemblyProductAttribute("IMTest")]
 [assembly: System.Reflection.AssemblyTitleAttribute("IMTest")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
diff --git a/backend/IMTest/obj/Debug/net8.0/IMTest.AssemblyInfoInputs.cache b/backend/IMTest/obj/Debug/net8.0/IMTest.AssemblyInfoInputs.cache
index d02b5c0..dfa3b85 100644
--- a/backend/IMTest/obj/Debug/net8.0/IMTest.AssemblyInfoInputs.cache
+++ b/backend/IMTest/obj/Debug/net8.0/IMTest.AssemblyInfoInputs.cache
@@ -1 +1 @@
-b9832b036b93c6518b1db1781b830178cbe943c60495856f215e90e2f16d822b
+0157672e490e31c525582995ff9972f067909b74fb5aeca923e211efe4aa3af8
diff --git a/backend/IMTest/obj/Debug/net8.0/IMTest.csproj.AssemblyReference.cache b/backend/IMTest/obj/Debug/net8.0/IMTest.csproj.AssemblyReference.cache
index 8df7a82..8398886 100644
Binary files a/backend/IMTest/obj/Debug/net8.0/IMTest.csproj.AssemblyReference.cache and b/backend/IMTest/obj/Debug/net8.0/IMTest.csproj.AssemblyReference.cache differ
diff --git a/backend/IMTest/obj/Debug/net8.0/IMTest.dll b/backend/IMTest/obj/Debug/net8.0/IMTest.dll
index 698670a..c856d72 100644
Binary files a/backend/IMTest/obj/Debug/net8.0/IMTest.dll and b/backend/IMTest/obj/Debug/net8.0/IMTest.dll differ
diff --git a/backend/IMTest/obj/Debug/net8.0/IMTest.pdb b/backend/IMTest/obj/Debug/net8.0/IMTest.pdb
index 3c5da42..d7f40fa 100644
Binary files a/backend/IMTest/obj/Debug/net8.0/IMTest.pdb and b/backend/IMTest/obj/Debug/net8.0/IMTest.pdb differ
diff --git a/backend/IMTest/obj/Debug/net8.0/ref/IMTest.dll b/backend/IMTest/obj/Debug/net8.0/ref/IMTest.dll
index 105c505..b4d29fa 100644
Binary files a/backend/IMTest/obj/Debug/net8.0/ref/IMTest.dll and b/backend/IMTest/obj/Debug/net8.0/ref/IMTest.dll differ
diff --git a/backend/IMTest/obj/Debug/net8.0/refint/IMTest.dll b/backend/IMTest/obj/Debug/net8.0/refint/IMTest.dll
index 105c505..b4d29fa 100644
Binary files a/backend/IMTest/obj/Debug/net8.0/refint/IMTest.dll and b/backend/IMTest/obj/Debug/net8.0/refint/IMTest.dll differ
diff --git a/backend/IM_API/Models/Conversation.cs b/backend/IM_API/Models/Conversation.cs
index 825a744..b9c5688 100644
--- a/backend/IM_API/Models/Conversation.cs
+++ b/backend/IM_API/Models/Conversation.cs
@@ -34,7 +34,9 @@ public partial class Conversation
 
     public string TargetName { get; set; } = null!;
 
-    public string TargetAvatar { get; set; } = null!;
+    public string? TargetAvatar { get; set; }
+
+    public int ChatType { get; set; }
 
     public virtual Message LastMessage { get; set; } = null!;
 
diff --git a/backend/IM_API/Models/ImDbContext.cs b/backend/IM_API/Models/ImDbContext.cs
index 8a6901e..eef5d0d 100644
--- a/backend/IM_API/Models/ImDbContext.cs
+++ b/backend/IM_API/Models/ImDbContext.cs
@@ -115,6 +115,7 @@ public partial class ImDbContext : DbContext
             entity.Property(e => e.Id)
                 .HasColumnType("int(11)")
                 .HasColumnName("ID");
+            entity.Property(e => e.ChatType).HasColumnType("int(11)");
             entity.Property(e => e.LastMessageId)
                 .HasComment("最后一条消息ID	")
                 .HasColumnType("int(11)")