diff --git a/client/client.cpp b/client/client.cpp
index 231a20c..d60c9f8 100644
--- a/client/client.cpp
+++ b/client/client.cpp
@@ -448,7 +448,11 @@ bool CClient::check_update_list(const std::string& content, std::map<std::string
             mperror("Not exist {}", vi[1]);
             break;
         }
+#ifdef _WIN32
         files[CCodec::ansi_to_u8(vi[0])] = CCodec::ansi_to_u8(vi[1]);
+#else
+        files[vi[0]] = vi[1];
+#endif
     }
     return valid;
 }
@@ -619,19 +623,23 @@ void CClient::handle_frame(CFrameBuffer* buf)
         break;
     }
     case TYPE_REQUEST_UPDATE_LIST: {
-        std::string content(buf->data_, buf->len_);
         std::map<std::string, std::string> files;
-        if (check_update_list(content, files)) {
-            buf->type_ = TYPE_CONFIRM_UPDATE_LIST;
+        if (down_ && down_->trans_state_ == TRANS_REDAY) {
+            buf->type_ = TYPE_BUSY_UPDATE_LIST;
         } else {
-            buf->type_ = TYPE_UNCONFIRM_UPDATE_LIST;
+            std::string content(buf->data_, buf->len_);
+            if (check_update_list(content, files)) {
+                buf->type_ = TYPE_CONFIRM_UPDATE_LIST;
+            } else {
+                buf->type_ = TYPE_UNCONFIRM_UPDATE_LIST;
+            }
         }
         std::swap(buf->tid_, buf->fid_);
         if (!send_frame(buf)) {
             mperror("Send Failed {}.", __LINE__);
             break;
         }
-        if (buf->type_ == TYPE_UNCONFIRM_UPDATE_LIST) {
+        if (buf->type_ != TYPE_CONFIRM_UPDATE_LIST) {
             break;
         }
         list_serve_id_ = buf->tid_;
@@ -658,6 +666,10 @@ void CClient::handle_frame(CFrameBuffer* buf)
         mpinfo("remote {} do task {} failed!", buf->fid_, list_file_);
         break;
     }
+    case TYPE_BUSY_UPDATE_LIST: {
+        mpinfo("remote {} are busy, will not exec task {}", buf->fid_, list_file_);
+        break;
+    }
     case TYPE_FILE_SIZE: {
         std::string str_size(buf->data_, buf->len_);
         long long size = std::stoll(str_size);
diff --git a/util/util.h b/util/util.h
index 2fad040..ba98657 100644
--- a/util/util.h
+++ b/util/util.h
@@ -17,6 +17,7 @@ enum FrameType : int16_t {
     TYPE_UP_LIST,
     TYPE_CANCEL_LIST,
     TYPE_OPEN_FILE,
+    TYPE_OPEN_FAILED,
     TYPE_TRANS_FILE,
     TYPE_TRANS_DONE,
     TYPE_INTERRUPT,
@@ -29,10 +30,10 @@ enum FrameType : int16_t {
     TYPE_CONFIRM_UPDATE_LIST,
     TYPE_UNCONFIRM_UPDATE_LIST,
     TYPE_DONE_UPDATE_LIST,
+    TYPE_BUSY_UPDATE_LIST,
     TYPE_FAILED_UPDATE_LIST,
     TYPE_GET_ID,
-    TYPE_FILE_SIZE,
-    TYPE_OPEN_FAILED,
+    TYPE_FILE_SIZE
 };
 
 using namespace ofen;