Culvert valve is the core component of HFSL,so specialized selection study is very necessary and significant.In this paper,based on the consideration of prototype measurement results of Jinghong HFSL,through the summary of hydraulic progress research of gate and valve,we got a conclusion that based on the mature cavitation defense technologies,we could properly reduce the cavitation performance of valves,reduce the valves cost by replacing piston valve with taper valve,and demonstrate the feasibility of valve selection research of HFSL.