Abstract: A new networking method that suits with underground working condition was introduced in the paper. Networking adopted cell system of frequency reusing, base station had 1 carrier frequency, 3 traffic channels and 1 specific signaling channel, radius of a cell is 500 m, adopted TDMA as measure of multi address. In order to improve call loss rate and update the safety of communication system to avoid appearing fade area when base station had fault, a method which allowed two mobile phone to perform point to point communication directly at the range of 0.5 km was introduced. In the process of point to point communication, two mobile phone can receive singling of base station respectively as well.