Abstract:LS-DYNA was used to establish the finite element model of multi particles impacting on alumina ceramics, and the erosion process was simulated by using LS-DYNA solver. The erosion mechanism was analyzed by observing the distribution of Von Mises stress of the target. The results show that volume loss rate of the target is increased with increasing the impact angle, and volume loss rate reaches the maximum value at the impact angle of 90°, which exhibits erosion characteristics of typical brittle materials. Volume loss rate of the target is increased with increasing the impact velocity, and they have good linear growth relationship. Volume loss rate of the target is increased with increasing the impact particle size as a whole, but it is decreased within a period of time when the impact particle size reaches a critical size. The target absorbs part of the particles kinetic energy and transforms it into internal energy, and when the particles leave the target surface, micro-crack and some elements failure are formed on the target surface, therefore, the target total energy is decreased with the failure of the elements.