Comparative study on economic efficiency of each region in China

China's economy has not broken away from the extensive high input development mode, and economic efficiency is low. Economic efficiency problem can never be avoided in the future economic development. This paper comparatively evaluate economic efficiency of each region, and propose the corresponding improvement measures, based on the DEA theory of C²R and BC² model, with 31 regions' economic efficiency as the research object, from the input-output Angle, and through technical efficiency, scale efficiency and production frontier projection. The empirical results show that each region of our nation have a great difference in economic efficiency and the cause of efficiency differences is different, and economic development efficiency of Beijing, Shanghai, etc. are the highest. There's a large connection between regional economic efficiency difference and regional economic inharmonious development.