diff --git a/wlkata_mirobot/wlkata_mirobot_serial.py b/wlkata_mirobot/wlkata_mirobot_serial.py
index f17574e..181b964 100644
--- a/wlkata_mirobot/wlkata_mirobot_serial.py
+++ b/wlkata_mirobot/wlkata_mirobot_serial.py
@@ -246,11 +246,11 @@ def __init__(self, mirobot, portname=None, baudrate=None, stopbits=None, exclusi
 		if autofindport and portname is None:
 			self.default_portname = self._find_portname()
 			""" The default portname to use when making connections. To override this on a individual basis, provide portname to each invokation of `WlkataMirobotGcodeProtocol.connect`. """
-			serial_device_kwargs['portname'] = self.default_portname
 			self.logger.info(f"Using Serial Port \"{self.default_portname}\"")
 		else:
 			# 设置端口号
 			self.default_portname = portname
+		serial_device_kwargs['portname'] = self.default_portname
 		# 创建串口设备
 		self.serial_device = DeviceSerial(**serial_device_kwargs)
 		# 打开串口