Analyses of Intra-industry Trade of Cars Based on Product VariationYU Xin,YE Hai-yan (School of Economy,Wuhan University of Technology,Wuhan 430070,China)Following the analysis in accordance with the theory of intra-industry trade,this paper calculate the statistic data from 1998 to 2007.And then utilizes the G-L index and GHM theory and practical examples aiming at determining and analyzing the types of intra-industry trade of cars in our country,so as to come to a conclusion that on which layer we locate in the international industrial value chain.At last,it gives some suggestions on how to improve our competitiveness in automobile industry.cars;intra-industry trade;horizontal differentiation;vertical differentiation;classification and analysis