In view of the influence of existing water conservancy projects on river connectivity,the construction of fishcrossing facilities is an important measure to solve this problem.Based on the operation characteristics of Mujing,Likou and Jiantan power station hubs,this paper analyzes the target of passing fish,the water level of inlet and outlet of fishway and the design flow rate,and put forward the recommended values of water level and velocity at the inlet and outlet of the fishway,which provides technical parameters for the construction of fishway in Mujing,Likou and Jiantan.