Abstract: Wireless transmission characteristics of ZigBee were tested and researched in simulated mine environment by use of underground straight tunnel. Firstly, path loss coefficient model was taken as wireless transmission model of mine tunnel, then some communication indexes were tested by use of two GAINZ nodes including wave of received signal strength indication and influence on received signal strength indication by obstacle at places with different distances away from sending node and packet reception rate and received signal strength indication under the condition of different distances between the nodes. The analysis conclusions of testing results are as following: in straight tunnels, the path loss coefficient model is feasible and correct for distance measurement and location by use of received signal strength indication; when distance between two nodes is from 30 m to 40 m in straight tunnels, ZigBee wireless transmission is reliable; parameters of the path loss coefficient model needs setting according to the environment in application of actual mine tunnels.