Abstract: In order to investigate the influence of the main control parameters of the skip-shaped inlet flow channel of the downstream Xingjiadu Yellow River Diversion Gate Pumping Station on the hydraulic performance, the N-S equation for three-dimensional incompressible fluid, the RNG k-ε model and the SIMPLEC algorithm were used to conduct three-dimensional turbulent numerical simulations on the influence of five control parameters, including the inlet height of the flow channel, the length of the flow channel, the height of the suction chamber, the inlet diameter of the flapper pipe and the inclination angle of the bottom of the flow channel, were numerically simulated. The relation among the flow rate distribution uniformity, the velocity weighted average angle and the hydraulic loss of the channel and the flow rate was analyzed under different control parameters. The results show that the height of the suction chamber and the inlet diameter of the horn tube have significant influence on the uniformity of the velocity distribution, while other control parameters have little influence. The value of different control parameters has a significant influence on the hydraulic loss of the flow passage, and it gradually increases with the increase of flow. The optimal hydraulic performance control parameters are proposed as follows: the inlet height of the channel, the length of the channel, the height of the suction chamber and the inlet diameter of the inlet horn tube are 1.51, 3.50, 0.80 and 1.50 times of the impeller dia-meter, respectively, and the bottom inclination angle of the flow channel is 0°. The results of the study can be used as a reference for similar engineering designs.