In view of the shortcomings of traditional gas concentration monitoring system, a remote wireless gas concentration moni- toring system based on STM32F103 is designed. The system uses STM32F103 microcontroller to control the sensor to realize the ac- quisition and processing of the underground gas concentration in real time. When the gas concentration exceeds the set upper limit, the system will send the sound and light alarm, transmit the collected data to the GPRS DTU, and then transmit the generated alarm signal and collected data to the monitoring center in time by using TCP/IP. The system can realize real-time monitoring by SMS or telephone, which greatly reduces the waste of human and financial resources.