According to the characteristics of underground transport system,radio frequency technology and RS485 bus are used to locate underground locomotive.Based on a unique design concept of control domain,the controlling system can implement the automatic signal transform of traffic lights through the master logical operation and according to the running conditions of locomotive.The successful application of the controlling system can solve the problems of underground traffic signal system requiring manual intervention,as well as the possible vehicle crash and the difficult issue,and can improve the efficiency of underground transport in the mine.