diff --git a/ComputingServices/ComputingServices/FileSystem/FileStream/FileStream.vb b/ComputingServices/ComputingServices/FileSystem/FileStream/FileStream.vb
index 4715416..89fada4 100644
--- a/ComputingServices/ComputingServices/FileSystem/FileStream/FileStream.vb
+++ b/ComputingServices/ComputingServices/FileSystem/FileStream/FileStream.vb
@@ -1322,7 +1322,7 @@ Namespace FileSystem.IO
             Dim invoke As New AsynInvoke(FileSystem)
             Dim rep As RequestStream = invoke.SendMessage(req)
             Call System.Array.ConstrainedCopy(rep.ChunkBuffer, Scan0, array, offset, count)
-            Return rep.ChunkBuffer.Length
+            Return rep.Protocol ' 在host的协议里面会将读函数的返回值放在protocol属性里面返回
         End Function
 
         ' Exceptions:
diff --git a/ComputingServices/ComputingServices/FileSystem/FileSystemHost.vb b/ComputingServices/ComputingServices/FileSystem/FileSystemHost.vb
index ca2138c..51854ba 100644
--- a/ComputingServices/ComputingServices/FileSystem/FileSystemHost.vb
+++ b/ComputingServices/ComputingServices/FileSystem/FileSystemHost.vb
@@ -87,8 +87,9 @@ Namespace FileSystem
             If OpenedHandles.ContainsKey(uid) Then
                 Dim stream As FileStream = OpenedHandles(uid)
                 Dim buffer As Byte() = handle.CreateBuffer
-                Call stream.Read(buffer, handle.offset, handle.length)
+                Dim n As Integer = stream.Read(buffer, handle.offset, handle.length)
                 Dim value As RequestStream = RequestStream.CreatePackage(buffer)
+                value.Protocol = CLng(n)
                 Return value
             Else
                 Return New RequestStream(Scan0, HTTP_RFC.RFC_TOKEN_INVALID, $"File handle {uid} is not opened!")