As a permanent hydraulic structure on a natural river，the construction of a certain dam hub will create a barrier to the continuity of the natural aquatic ecological environment of the original river，affecting the migration and reproduction of fish.To ensure the effectiveness of fish migration，it is necessary to build fish lanes on the hub.We carry out the study on the overall hydraulic characteristics of the fishway and the number and layout of its inlet and outlet under different water level combinations，in order to determine whether the design scheme of the fishway can meet the hydraulic conditions.We use a physical model test method with a scale of 1:16 to verify the reasonability of the fishway design scheme.The results show that under the recommended layout of the fishway and the implementation of water replenishment measures in the inlet section，all hydraulic indicators can meet the codes and design requirements.When the mainstream flow velocity at the entrance of the fishway is relatively low，it is necessary to adopt inlet section water replenishment measures to meet the requirements of fish-luring design.