The Fomian beach，which is a reef extending the heart of the river between Fuling and Fengdu reach of the Yangtze River，causes strong cross flow and flow disorder in the flood season,so the ship must go upstream by crossing the river and conflict with the downstream route,resulting in endangering the safety of the ship’s navigation.By blasting partial reef of Fomian beach,we can improve the navigation flow condition and realize the ships “Keeping at the right and sailing side by side”.By establishing two-dimensional flow mathematical model of the Fomian beach to simulate the flow field of the multi-stage flow,we determine that the most turbulent flow is 24 500 m3/s.By simulating eight reef blasting schemes of different explosive depths under the most turbulent flow and comparing the flow velocity,transverse velocity,ratio of transverse and longitudinal velocity,ratio of propulsive and drag force,effect ratio of unit depth of each reef scheme and flow regime,we know that the optimal reef blasting scheme of 8.0 m explosive depth is the best.