diff --git a/src/HPSocket.Net/Adapter/TerminatorDataReceiveAdapter.cs b/src/HPSocket.Net/Adapter/TerminatorDataReceiveAdapter.cs
index c311f5a04c5b519cfd4ce8668212d283dcf22aa9..b298ff1d9a2e5422424427e72f6b77023b0e2225 100644
--- a/src/HPSocket.Net/Adapter/TerminatorDataReceiveAdapter.cs
+++ b/src/HPSocket.Net/Adapter/TerminatorDataReceiveAdapter.cs
@@ -59,7 +59,7 @@ namespace HPSocket.Adapter
             foreach (var index in findList)
             {
                 // 数量
-                var bodyLength = index + 1 - lastPosition;
+                var bodyLength = index - lastPosition;
 
                 // 得到一条完整数据包
                 var bodyData = cache.Data.GetRange(lastPosition, bodyLength).ToArray();
diff --git a/src/HPSocket.Net/HPSocket.Net.csproj b/src/HPSocket.Net/HPSocket.Net.csproj
index 0c85d412615cffb0caaf5d4daf95e14d231b9661..21cc73ff97abd2a662160c5d4b53d037afc62b8e 100644
--- a/src/HPSocket.Net/HPSocket.Net.csproj
+++ b/src/HPSocket.Net/HPSocket.Net.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<!--<TargetFrameworks>netcoreapp2.0;netcoreapp2.1;netcoreapp2.2;netcoreapp3.0;netcoreapp3.1;netstandard2.0;netstandard2.1;net20;net30;net35;net35-client;net40;net40-client;net45;net451;net452;net46;net461;net462;net47;net471;net472;net48</TargetFrameworks>-->
-		<TargetFrameworks>netstandard2.0;net20;net40</TargetFrameworks>
+		<TargetFrameworks>netstandard2.0;net20;net40;netcoreapp3.1</TargetFrameworks>
 		<Platforms>AnyCPU</Platforms>
 		<GeneratePackageOnBuild>false</GeneratePackageOnBuild>
 		<AssemblyName>HPSocket.Net</AssemblyName>