Abstract: The surface erosion of a rectangular stainless-steel plate, sputtered at an angle by solid-liquid twophase jet, was mathematically modeled, theoretically analyzed and numerically simulated in finite element method.The influence of the particle properties, including the size, position, mass fraction and velocity of solid particles at the nozzle's outlet, on the erosion wear-rate was investigated. The simulated results show that the particle properties have a major impact. For example, the fluid velocity at the outlet is about 10 m/s; a high pressure stagnation region appears at the nozzle's attachment after the plate forces the fluid to downstream; the wear-rate in the downstream is significantly higher than that in the upstream, a roughly increasing radial wear-rate profile exists in the plate's sampling-circle. As the fluid flows downstream, both the impact and wear-rate change in an increase-decrease mode. The average wear-rate depends exponentially on the jet velocity.