Based on the two-way relay system,this paper focuses on the channel capacity of MIMO-PNC system. Several relay schemes and their channel capacity are briefly introduced,but the throughput of the PNC amplify-forward relay system is described in detail.With MIMO technique,the MIMO-PNC relay system is built upon PNC relay scheme,and the channel capacity is obtained for MIMO-PNC relay system. The simulation is performed for several relay schemes. The MIMO-PNC relay system has an obvious superiority.The simulati...