STBC-MIMO network coding with adaptive spatial modulation for the asymmetric channel and traffic is proposed in this paper. The proposed scheme can select the suitable modulation level every wireless link. In this paper, the throughput performance on the asymmetric channel of the proposed scheme are evaluated by computer simulation. As a result, it is shown that proposed the scheme is effective to achieve the high efficiency two-way network even if the asymmetric channel or traffic compared with the conventional MIMO schemes.