Since 1978, technology importing aggregate and R&D input of our country increase very fast. The increase of two inputs influences the TFP' s improving of our country. Based on current literatures, after assessing CES production function by NLS, some conclusions are drawn. Although technology importing and R&D input add the technology and knowledge of our country, the TFP didn' t improve quickly. The proportion between technology importing and R&D input isn' t rational. We should ...