Study of the Technology Collaborative Innovation and Efficiency from Two-stage Chain Perspective ——Based On China's 28 provinces and cities in the data of the high-tech industry

When using the chain DEA model to research the input and output of two-stage efficiency, the correlation between the stage input and output results is ignored, and two-stage segment efficiency role in promoting the overall efficiency of detection is not available, which could easily lead to low correlated coupling of factor inputs and outputs. Based on the grey relational analysis of various stages of input factors and output results, an empirical analysis on input-output data of high-tech industry’s two-stage technology in China's 28 provinces is made by using the chain DEA model, and then the affection of the phase efficiency on the overall efficiency is verified by using the single-factor regression model testing. Finally, provinces and cities are divided into four types according to the empirical results, and policy suggestions are put forward.