The improvement of transportation infrastructure makes trade integration, and enterprises are more inclined to invest in areas with developed transportation. Convenient transportation can reduce transportation costs and transaction costs, and save time costs. Transportation infrastructure investment can make the initial investment effect multifold through the multiplier effect, which can promote the development of relevant industries in the region and promote the economic growth of the region The continuous improvement of transportation infrastructure promotes the economic growth of this region, and also drives the economic development of the surrounding areas, making the surrounding areas benefit from the spatial spillover effect In addition, the direct improvement of transportation facilities in the relatively backward areas can increase the activities of the backward areas, promote the economic development of the region, reduce the cost of living in the backward areas, attract investors to invest in the backward areas, improve the welfare level of residents in the backward areas, improve the transport network, improve regional accessibility and promote knowledge The spread of technology is conducive to the optimization of resource allocation, economic agglomeration and market expansion, the realization of agricultural commercialization, industrial specialization and employment scale enlargement, and finally the realization of economic growth