As a national demonstration zone, the research on Wanjiang City belt can provide reference for other regions to undertake industry. Based on the theory of industrial gradient, the paper first establishes the competitive industries in Wanjiang nine cities. Then due to the relative industrial gradient coefficient, the key industries of each city are determined. The results show that industrial transfer mainly concentrated in the industry of chemical engineering, metal smelting, electric machinery, equipment manufacturing, textile and other industries. Because of repetitive industries, attention should be paid to the coordination of competition. At the same time, attention should also be paid to environmental protection in undertaking resources dependent and high polluting industries.