Spatial-temporal channel simulator is necessary for proper designing, analyzing and implementing multi-antenna system. A new geometrical based spatial-temporal channel simulator is proposed, which assumes double bounce scattering components are dominant multipaths received by base station and mobile as well as single bounce scattering components. Considering that scatterers from different distances to mobile influent signal propagation dissimilarly, two different scatterers distribution densities within the coverage area are put into application. Comparition of an example of urban channel simulation with measurement results shows that the simulator is capable to characterize most of properties of urban channel. The simulator can also be configured to meet the different requirement of angle spread and delay spread for estimating the robust of multi-antenna system。