Abstract: Antenna mutual coupling (MC) is considered and the general coupling coefficients matrix from the equivalent network model of the multiple-antenna is obtained. Indoor multiple input multiple output (MIMO) wireless channel model is extended by using mutual coupling compensation method, and the effects of MC on the capacity of indoor MIMO channels are analyzed numerically. The conditions that MC has no effect on the spatial correlation are identified. Simulation results show that MC can cause the antenna pattern distortion which brings angel diversity and low correlation so as to improve channel capacity.