Abstract: In view of the problems of raceway and diagonal flow (whirling flow and skew flow) during the operation of the Xifeihe combined sluice-pump station alone, the hydraulic model tests on the combined sluice-pump junction are carried out by use of the integral normal model. Under the working conditions of drainage, seven kinds of rectification schemes of the diversion pier are designed, such as different lengths of the diversion pier, opening size of different diversion piers, spacing between openings and the height of openings. And only the 25 m long diversion pier scheme and the optimal opening size of the diversion piers are studied under the working conditions of self-drainage and velocity distribution. By comparing the size of the raceway area beside the diversion piers and the velocity uniformity of each opening, the model tests show that the length of the diversion pier is 25 m, the opening width is 4.5 m, the distance between the adjacent opening spacings is 6.25 m, and the opening height is 5 m. The scheme of adding a 1 m short diversion pier between the 5# and 6# channels can reduce the water swirling area in the forebay of the pumping station and the front of the sluice, so as to improve the flow pattern of the water flow, increase the velocity uniformity of each opening, and provide good hydraulic conditions for the operation of the combined sluice-pump station. The experimental research results can provide technical references for the selection of the rectification scheme of the diversion piers in combination of the sluice with the pumping stations.