本文介绍了西门子的GSM 无线通信模块TC35i，并提出了由TC35i 模块通过搭建外围电路构成一个GSM Modem，PC机通过串口数据线向其发送 AT指令，从而实现短消息的发送和接收。详细介绍了TC35i的外围电路设计，给出了实际的电路连接图，并介绍了通过PC机给TC35i写AT指令从而实现收发短消息的过程。-This paper introduces the Siemens GSM wireless communication module TC35i, and TC35i module by the external circuit through the structures constitute a GSM Modem, PC machine through the serial data line to send AT commands, in order to achieve short message sending and receiving. TC35i described in detail the external circuit design, given the actual connection graph of the circuit and through the introduction of the PC-to TC35i write AT command in order to realize发短消息admission process.