Abstract: In this paper, by using CC2430 chip as the core, it designed a set of personnel positioning module, which had two-way communication function and was suitable for underground coal mine. The module function included work attendance undermine, personnel real-time monitoring, two-way risk warning, victims calling for help. It used time slice scheduling method of response mechanism in means of communication, and achieved the anti-collision algorithm of identification card to ensure information transmission smooth and timely.