Abstract: According to the characteristics of the Zongyang nature-like fishway and the requirements of fish passing,a three-dimensional generalized turbulent numerical model of fishway pools under the continuous bend arrangement is established. And the optimization idea of the flow conditions is put forward. Through the gradual improvement of five schemes,the flow conditions in the fishway pools are optimized,and the structural layout parameters of pools are obtained. The results show that under the comprehensive influence of various factors,the flow pattern in the fishway pools is extremely complex. By adopting some measures such as increasing the offset distance of the vertical slot and prolonging the main flow path,reducing the width of the vertical slot and increasing the local resistance,shortening the length of fishway pools and increasing the resistance,the flow velocity in the fishway pools can be reduced. At the same time,the curvature of the main stream should be controlled and the excessive deviation from the center line of the adjacent vertical slot should be avoided to cause flow disorder. Under the recommended fishway layout,the maximum velocity in the vertical slot area can be basically controlled at 0.7～0.9 m/s,the main flow in pools is clear,and the flow pattern is good,which can basically satisfy the fish passing requirements. The relevant research methods can provide a reference for similar projects.