Abstract: In this paper, it is introduced that the principle of current mainstream wireless ranging technology, such as RSSI, TOA, TOF, SDS-TWR, etc. The aspects are compared and analyzed that the advantages and disadvantages of various ranging methods and their application feasibility of coal mine personnel positioning system. It is presented briefly that a new mine personnel positioning system based on SDS-TWR location algorithm and the actual test result. Finally, it is pointed out that the development trend and direction of personnel positioning technology in coal mine.