Locomotive monitor system is a kind of basic facilities to make sure the safe of transporting and efficient dispatching underground. It is designed to assure the locomotive safe running, enhance the productive efficiency, reduce the transport expense and improve the operating circumstances. This paper presents the monitor system for coal mine based on the RFID and WIFI technology. In order to meet the functions, install all kinds of sensors in the system. Judge the location or state of the locomotive and enhance the running security of locomotive by monitoring environment with the information merging technology. Build the wireless Ethernet based on WIFI in the coal mine to fulfill the voice and data exchange between the locomotive and the dispatching center so that the dispatcher can dispatch the locomotive efficiently and in time based on the datum from the locomotive. This paper presents the system framework and pays more emphasis on the program design of the terminal monitor and the realization. The system has run in good condition underground and promotes the locomotive safety and dispatching efficiency significantly.