In order to explore the reasonable shape of the Huangchigou overflow bend channel, the influence of shape parameters on the flow was studied by means of orthogonal design and numerical simulation.Different parameter combinations were determined based on orthogonal experimental design for three shape parameters, including width of bend, radius of curvature and longitudinal slope. Nine sets of orthogonal experimental schemes were determined and simulated by the numerical model after validation by the experimental results from hydraulic model tests. The main factors affecting the water level difference in the bend sections and steep slopes were analyzed.The results show that the effect of the three shape parameters from the largest to the smallest is the longitudinal slope, bend width and the radius of curvature.The slope is a significant factor, and the flat slope is the best. The curvature radius and width of the bend have no significant impact. Therefore, a reasonable shape parameter is recommended that the slope is 0, and the original design values should be maintained for curvature radius and width of the bend.