diff --git a/SerialPort/utils/GodSerialPortUtils.cs b/SerialPort/utils/GodSerialPortUtils.cs
index e90e10b..f07929b 100644
--- a/SerialPort/utils/GodSerialPortUtils.cs
+++ b/SerialPort/utils/GodSerialPortUtils.cs
@@ -3,6 +3,9 @@ using GodSharp.SerialPort.Extensions;
 using GodSharp.SerialPort;
 using System.IO.Ports;
 using System.Text.RegularExpressions;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
 
 namespace Soul2.SerialPort.utils {
     /// <summary>
@@ -113,6 +116,7 @@ namespace Soul2.SerialPort.utils {
         /// </summary>
         /// <returns>是否已关闭</returns>
         public static bool close() {
+            be_sending = false;
             if (gsp == null) {
                 return true;
             }