Intra-industry trade refers to the economic the phenomenon of exising import and export in the same product sector of one country or region at the same time. Intra-industry trade has become an import driving force to promote international industry division and accelerate new industry development. One the one hand, Intra-industry trade promotes the shaping of scale economy and product differentiation, lessens the importance of factor endowment between different countries, and improves industrial internationa...