The aircraft power system technology is one of the core technologies urgently needed studying of new generation aircraft. With the development target trend of more electricity，high efficiency，more cleanliness and intelligence，and less pollution，the technology study of aircraft power system becomes more important，especially for the aircraft new performance requirements of integration，more electricity，interconnection，intelligence and efficiency，the aircraft power system is the significant support for the new requirements. According to the development of abroad power system technology，and proceeding from the high efficient idea of new generation aircraft power system，the concrete scheme of new generation aircraft power system realizing the multi-electric technology，mixture driving technology and power drive technology is introduced，four key technologies and market trend of aircraft power system are analyzed，and the technology difficulties are pointed out. This aircraft power system technology can provide the reference for the design and future development of new generation aircraft study.