The original planning cascade scheme of the Pengshan Jiangkou to Leshan section of the Minjiang River is close，the kinetic energy economic index of the power station is poor，and the development is difficult. Regarding these problems，with the goal of fully realizing the upgrading of the Minjiang River waterway，combined with the changes in the planning and construction conditions，the problems and effects of the optimization plan in terms of navigation，power generation efficiency and environmental impact are comprehensively analyzed，and the optimization scheme for the cascade development from the Pengshan Jiangkou to Leshan section of the Minjiang River is optimized from 8 to 6 levels. The optimization scheme provides technical support for the preparation of the shipping development plan for Chengdu to Leshan section of the Minjiang River，significantly improves the shipping efficiency，power generation efficiency and water environment benefit，greatly improves the feasibility of the development scheme，and lays a solid theoretical foundation and planning guidance for the construction of the Minjiang River high-grade waterway.