It has been proved that Physical-layer Network Coding(PNC)can boost the system throughput obviously and decrease the error rate by reducing the time slots of inter-communication,which makes signal processing efficient and reliable.Coded Modulation(CM)considers coding and modulation as a whole,which makes coding and modulation effective without decreasing system transmission rate,to guarantee bandwidth efficiency.In this paper,the basic idea of the CM and its implementation are introduced.We analyze the effect of the combination of CM and PNC for communication system performance,which provide the foundation for future research.