Abstract: By using the improved G-L index to measure the level of intra industry trade between China and BRICs,and comparing with the intra industry trade between with different development levels,it shows that the level of intra industry trade of BRICs is significantly lower than that of developed countries,and the different development levels are not the absolute factors restricting the intra industry trade between the two countries.By measuring the level of intra industry trade of 0-8 products between China and BRICs under SITC(Rev.4),it shows that there are obvious differences in the level of intra industry trade of different countries and products within BRICs.Using the grey correlation analysis method to calculate the correlation degree between the influencing factors and the level of intra industry trade,it is concluded that the differences in market size,per capita income,market openness and foreign direct investment have a greater impact on intra industry trade.Therefore,it is necessary to carry out cultural exchanges,give full play to comparative advantages,enhance innovation ability,and focus on the targeted adjustment according to the effect intensity of influencing factors,so as to improve the level of intra industry trade between China and other BRICs.

Key words: BRICS, intra industry trade, G-L index, gray correlation analysis