Abstract: This study aims to address unfavorable flow conditions, such as vortexes and flow deviation, in the intake sump of a sluice-pump station. The effectiveness of cross-shaped vortex baffles in rectifying flow in the forebay and intake pipes is investigated using numerical simulation. The influence of different lengths of diversion piers on flow state is analyzed, considering flow velocity uniformity and speed-weighted average angle at two water levels: operating water level and low water level. The results are compared with a non-rectification scheme based on parameters from the Sizhihe sluice-pumping station. An orthogonal test method is employed to analyze the impact of the size of the cross-vortex eliminator at the horn mouth. The findings indicate that the optimal rectification scheme combines a diversion pier length three times the bell mouth diameter with a cross-vortex eliminator. The cross-vortex eliminator has an upper edge width of 60 mm, a lower edge width of 1200 mm, a lower base height of 60 mm, a thickness of 10 mm, and an overall height of 160 mm. This scheme significantly reduces the vortex area and improves flow velocity uniformity by 5.88% and 2.73%, respectively, while increasing the weighted average angle by 2.83° and 1.33° at the operating water level and low water level compared to the non-rectification scheme. The combined rectification scheme promotes uniform streamlines and effectively enhances water inlet conditions and vortex dynamics at the horn mouth. These research findings provide valuable insights for multi-parameter optimization and the engineering design of pump stations combined with sluice stations.