diff --git a/NetLib/HaoYueNet.ClientNetworkNet4x/HaoYueNet.ClientNetworkNet4x.csproj b/NetLib/HaoYueNet.ClientNetworkNet4x/HaoYueNet.ClientNetworkNet4x.csproj
index 2d6a583..39011da 100644
--- a/NetLib/HaoYueNet.ClientNetworkNet4x/HaoYueNet.ClientNetworkNet4x.csproj
+++ b/NetLib/HaoYueNet.ClientNetworkNet4x/HaoYueNet.ClientNetworkNet4x.csproj
@@ -24,6 +24,10 @@
     <WarningLevel>4</WarningLevel>
     <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
+  <PropertyGroup>
+	<!--避免 错误	CS8630	无效的 nullable 值: C# 7.3 的“Enable”。请使用语言版本 8.0 或更高版本 -->
+   <LangVersion>8.0</LangVersion>
+  </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
diff --git a/NetLib/HaoYueNet.ClientNetworkNet4x/OtherMode/NetworkHelperCore_ListenerMode.cs b/NetLib/HaoYueNet.ClientNetworkNet4x/OtherMode/NetworkHelperCore_ListenerMode.cs
index eae28e4..f1315b6 100644
--- a/NetLib/HaoYueNet.ClientNetworkNet4x/OtherMode/NetworkHelperCore_ListenerMode.cs
+++ b/NetLib/HaoYueNet.ClientNetworkNet4x/OtherMode/NetworkHelperCore_ListenerMode.cs
@@ -1,14 +1,13 @@
-using System.Net;
-using System.Net.Sockets;
-using static HaoYueNet.ClientNetworkNet4x.BaseData;
+using System;
 using System.Collections.Generic;
-using System.Threading.Tasks;
-using System;
 using System.IO;
-using System.Threading;
 using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading;
+using System.Threading.Tasks;
 
-namespace HaoYueNet.ClientNetwork.OtherMode
+namespace HaoYueNet.ClientNetworkNet4x.OtherMode
 {
     public class NetworkHelperCore_ListenerMode
     {
diff --git a/NetLib/HaoYueNet.ClientNetworkNet4x/OtherMode/NetworkHelperCore_SourceMode.cs b/NetLib/HaoYueNet.ClientNetworkNet4x/OtherMode/NetworkHelperCore_SourceMode.cs
index 6a320fe..f9717de 100644
--- a/NetLib/HaoYueNet.ClientNetworkNet4x/OtherMode/NetworkHelperCore_SourceMode.cs
+++ b/NetLib/HaoYueNet.ClientNetworkNet4x/OtherMode/NetworkHelperCore_SourceMode.cs
@@ -5,7 +5,7 @@ using System.Net.Sockets;
 using System.Threading;
 using static HaoYueNet.ClientNetworkNet4x.BaseData;
 
-namespace HaoYueNet.ClientNetwork.OtherMode
+namespace HaoYueNet.ClientNetworkNet4x.OtherMode
 {
     public class NetworkHelperCore_SourceMode
     {
diff --git a/NetLib/HaoYueNet.ServerNetworkNet4x/HaoYueNet.ServerNetworkNet4x.csproj b/NetLib/HaoYueNet.ServerNetworkNet4x/HaoYueNet.ServerNetworkNet4x.csproj
index a1fae3f..9862383 100644
--- a/NetLib/HaoYueNet.ServerNetworkNet4x/HaoYueNet.ServerNetworkNet4x.csproj
+++ b/NetLib/HaoYueNet.ServerNetworkNet4x/HaoYueNet.ServerNetworkNet4x.csproj
@@ -22,6 +22,10 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
+  <PropertyGroup>
+	<!--避免 错误	CS8630	无效的 nullable 值: C# 7.3 的“Enable”。请使用语言版本 8.0 或更高版本 -->
+   <LangVersion>8.0</LangVersion>
+  </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>