The CAFFA was established on January 1, 2010. It is theoretically and practically significant to analyze the intra-industry trade between China and ASEAN countries. The paper uses G-L index and GHM method to analyze the CAFTA's intra-industry trade. Based on the random effect model of panel data, the research results show that the effect factors of the intra-industry trade include country-specific factors and industry-specific factors. Country-specific factors include relative factor abundant difference, sustainable development difference and market avera...