Abstract: According to special space of mine tunnel,the paper supposed geometric distribution of scatters which was totally different from the ones on the ground, put forward a new 3D-GBSB model of MIMO channel,and dudeced the space-time correlation function of the model.It simulated and analyzed the correlation function and channel capacity by geometry analytic method to get the best scheme of antennas layout.The simulation result showed that the channel capacity of the wireless system can be enhanced obviously through reasonable antenna layout in tunnel.