Abstract: With the process of economic integration, the trade volumes become more and more large. Taking full advantages of themselves,different regions get win-win benefits by learning from other＇s strong points to offset their weakness in economic and trading activity that promote common development of regional economy. As the international trade, the rationality also exists in the structure of exchange products in regional industry. To inquire into its rationality is helpful to coordinate the development of regional economy scientifically and effectively, as well as to accelerate the formation of economic integration. Applying the connected model between input and output, this article is to have empirical research into the rationality of exchange products structure in China＇s regional industry.