Abstract: Based on the CFD-DEM（computational fluid dynamics-discrete element method） coupling method, the solid-liquid two-phase flow in the centrifugal pump and the erosion of the flow parts were calculated. The average erosion rate of the impeller, the velocity distribution of the liquid phase, the movement of the particles, the number of contacts between the particles and the wall, and the contact force at different blade wrap angles were studied. The study shows that as the wrap angle increases, the head, efficiency and average erosion rate all increase first and then decrease. When the wrap angle is 110°, the contact force and the number of contacts between the particles and the wall surface are the largest, resulting in the most serious erosion. The position of severe erosion locates at the junction of the middle of the suction surface and the shroud. When the wrap angle increases from 90° to 110°, the increase of contact times and force between particles and flow part walls increases the erosion. When the wrap angle increases from 110° to 160°, the low-velocity area of the suction surface gradually decreases, resulting in a gradual decrease of low-velocity particles gathered in the middle of the suction surface, reducing the area where the suction surface is severely eroded.