Due to the coal mine production environment, there often have the bad gas coal-dust explosion, fire, floods and other security hidden danger, coal mine safety accidents occur frequently. This paper introduces a design method of using the average of RSSI miners positioning system: use of personnel carries out the location of the machine, the positioning machine collect the base RSSI value and coordinates on the top of the collection of several positioning, through the collection of value to RSSI averaged calculation thus selection signal strength to the mean of RSSI value, these constitute list next RSSI value through the channel attenuation model into the corresponding distance measurement algorithm, using the trilateral out the orientation of the coordinates of the machine. At last, this system can communicate by the positioning base stations, gateway and ground of PC. It realize the quickly location of the miners and attendance tracking management, and can provide effective, fast relief help to the sudden mine accidents. It also take a good stimulative effect for the coal mine safety in production.