In order to research and develop ecological structure and provide technical support for the construction of ecological channel,based on the investigation and analysis of aquatic organisms,the structure form of penetrating frame dam is proposed.Based on the results of the flume experiment,the difference between the penetrating frame dam and the solid dam is analyzed,and the ecological effect of the penetrating frame dam is analyzed from the aspects of fish-collecting effect and improving the habitat suitability of fish.The main conclusions are as follows:1)According to the flow field distribution,there is a return current zone behind the dam for solid dam within a certain range,there is no return current zone behind a penetrating frame dam;2)Penetrating frame dams are proved weaker (the depth of scour hole of penetrating frame dams is 60% that of the solid dams) and last longer;3)Penetrating frame dams can play the role of artificial fish reef,the internal gap of frame dam provides habitat for fish and other aquatic creatures,and has a strong attraction effect on fish;4)Penetrating frame dams improves the habitat suitability of the fish by increasing the oxygen content in the water and the area of the velocity zone.