diff --git a/Protocol/HDSDK.cpp b/Protocol/HDSDK.cpp
index f703041..eebbeca 100644
--- a/Protocol/HDSDK.cpp
+++ b/Protocol/HDSDK.cpp
@@ -547,7 +547,7 @@ bool HDSDKPrivate::ParseReadData(const std::string &data)
         return false;
     }
 
-    std::string buff = detail::Mid(data, 0, len);
+    std::string buff = detail::Mid(readBuff_, 0, len);
     detail::Remove(readBuff_, 0, len);
 
     bool result = true;
@@ -636,8 +636,8 @@ bool HDSDKPrivate::ParseSDKCmdAnswer(std::string &&data)
 
     sdkBuff_.append(data);
     if (total <= sdkBuff_.size()) {
-        std::string buff(std::move(sdkBuff_));
-        sdkBuff_.clear();
+        std::string buff(sdkBuff_.substr(0, total));
+        sdkBuff_ = sdkBuff_.substr(total);
         ReadXml(buff, 0);
     }