Abstract: In order to solve the problem of large-scale backflow in side-inlet forebay of Shiqiao Pumping Station in Yangzhou City, Jiangsu Province, Shiqiao Pumping Station intake structure is taken as the research object based on Reynolds time-averaged equation and RNG k-εmodel, CFD software is used for numerical calculation of side-inlet forebay and intake sump. The flow characteristics of forebay and intake sump are analyzed under different rectification measures. Several rectification measures are proposed and the effect of flow pattern control is quantitatively analyzed. The result shows that the flow pattern of 2# and 6# intake sump is comparatively disordered without rectification measures, as the streamline is distributed unevenly. Through an analysis of three rectification measures, the streamline distribution of the intake sump is uniform and the flow velocity distribution is reasonable when the bottom ridge is added to the forebay. Axial velocity distribution uniformity of inlet characteristic section in intake sump is increased by about 30% on average in each pump unit, indicating a significant rectification effect. The research findings serve as a reference for the flow pattern improvement of similar pumping station projects.