Abstract: Abstract: This article proposed a typical impeller structure of new type of sewage pump to solve the blocking and wear problem in sewage pumps. Using an orthogonal experiment of L9(34), which contains factors of outlet blade angleβ2, impeller inlet diameter Dj, impeller outlet width b2, and impeller outlet diameter D2, nine groups of schemes were designed. Four geometric parameters were researched to analyze the influence on sewage pump performance by orthogonal experiments. Optimized design schemes were achieved, and we conclude that impeller outlet diameter D2 is the main factor that affects the efficiency and pump head. Second, the solid-liquid two-phase flow was studied on the basis of a turbulence model and a model of the discrete-zero equation. On the basis of the orthogonal optimization model, the back-swept angle was changed to study the different particle distributions associated with the back-swept angle and non-back-swept angle. We further explored the effect of the back-swept angle on sewage pump performance. The angles were 60 degrees, 80 degrees, 100 degrees, and 120 degrees, respectively. The research shows that the degree of swept-back angle has little influence on sewage pump head. Nevertheless, it has significant influence on pump efficiency when the solid particle diameter is 0.4 mm and the solid volume fraction is 5 percent. The optimization model was made into a prototype with the swept angle of 80 degrees in the plant of Nanjing LanShen Pump Co., LTD, to perform the experiment. The test system consisted of an electric pump, a torque sensor, and a pressure sensor. By comparing numerical results with experimental results, the result indicates that the double bladed, large wrap angle, and leading edge sweep design make the particles move around the outer perimeter of the blades to ensure the passage capacity and operational efficiency of sewage pumps and greatly reduce the wear of blade. Consequently, the service life of the sewage pump can be improved. The rotation of the impeller caused the velocity variation in the back-swept sewage pump and velocity circulation amount distributes around the flow field. The inlet velocity rotated with the impeller high-speed revolution, and the outlet velocity changed radically. The figure illustrates that the solid volume fraction in the pressure side is greater than that in the suction side. That is, particles move towards the pressure side of blade. Therefore, wear and tear on the pressure side is more serious than the suction side. The distribution of total pressure and solid volume fraction are different from the pressure to the suction side. When the back-swept angles are 60 degrees and 80 degrees on the suction side, the total pressure follows a declining trend from the suction side to the pressure side. It means that the field near the imports falls sharply, and then falls gently. However, the total pressure decreases initially and then begins to increase with the increase of the back-swept angle, when the angles are 100 degrees and 120 degrees. At the same time, the solid volume fraction exhibits a downward trend. According to the test results, the efficiency of the model pump can reach 80% with a pump head of 11 m at rated conditions. The test result is 2.5% higher than the National Standard.