By using the efficiency evaluation model of fish passage facilities, it is found that the attraction flow at the entrance is the key factor affecting the efficiency of fish passage facilities. This paper studies the current situation of fish passage facilities in China, and points out the shortcomings in the design of entrance attraction flow of fish passage facilities in China. Combined with the characteristics of water conservancy and hydropower projects, from the perspective of attraction flow and competition flow of fish passage facilities, the design ideas of key issues such as the location of fish passage facilities, the position of the entrance, the entrance orientation, the flow and velocity of the entrance attraction flow are given, and a generalized model of the entrance of fish passage facilities is proposed.