Abstract: The fish passage facilities in combination with a nature-like fishway and a structural fishway have the advantages of the nature-like fishway and the structural fishway, and can also meet the harsh terrain conditions. In this paper, based on the design scheme and the optimization scheme, the overall model of 1:10 scale is respectively established for the Dipanzi fishway. The rationality of the design scheme and the optimized effects of the optimization scheme are demonstrated by measuring the water level, flow velocity and pattern of the two schemes. The model test analysis results show that the flow pattern in the fish passage facility with vertical slots and natural imitation is good, and there are no adverse impacts on the flow pattern in the joint section when the structure section and the nature-like section are connected by a larger bottom slope ratio; the average flow velocity of the overflow slots and vertical seams is basically kept within 0.7 and 1.2 m/s, and the high flow velocity area is mainly distributed near the connection section and the entrance of the fishway. Compared with the design scheme, the width of the vertical slots of the section S52-S57 of the structural section of the fish passage facility in the optimized scheme increases by 25%, and the energy dissipation rate of the fishway pool chamber decreases by 50%. The water depth at the entrance of the nature-like fishway section increases from 1.0 m to 1.3 m, while the maximum flow velocity along the F63-F68 section is reduced by 52%, which effectively guarantees the conditions for fish passage. The experimental research results can provide references for the design and construction of the fish passage facilities on the complex sites.