Taking the fishway project of Jiepai hub as an example,we simulate the downstream channel of Jiepai hub by using ecological hydraulic characteristics and two-dimensional hydrodynamic model,analyze the hydraulic characteristics of fishway entrance under multi-complex scheduling of power station and sluice gate control,and optimize the scheme.The results show that the flow index of fishway entrance under new and old power station operation is rather large and beyond the scope of smooth upward trace of fish for the previous design scheme.While the flow velocity near fishway entrance is apt to satisfy the design requirements if outlet channel of power station near fishway entrance is properly widened.It is suggested to further excavate the left side of the original design tail water outlet so as to make fishway entrance move upward,and create good conditions of fishway entrance.