Abstract: A regional positioning detection system based on GIS for the underground locomotive is introduced，which could effectively improve the use of underground locomotive at present.The system mainly includes the locomotive detectors，the testing substations and the host computer，Of which，the locomotive detector is used to measure speed and make alarm once the locomotive is over speed，and sends such information as speed，train number and carriage to the testing substation via wireless transmission technology.The testing substation then uploads the received data to the host PC through the underground ring network.According to the data，and by using the GIS software MapX and VB for development platform，the PC will realize real-time simulation for the underground locomotive operation condition.

Key words: Regional positioning, Locomotive detectors, Testing substations, Host computer