<p>To solve the problem of erosion wear of the core wall of the injection mold by fiber particles, Moldex3D analysis software was used to analyze the influence of flow rate and melt temperature parameter level on melt erosion velocity from the perspective of the multi-cavity injection molding process. This analysis was based on the flow equation of reinforced fiber plastic melt and the fiber orientation model. The problem of melt erosion velocity and fiber particle orientation at the gate location was analyzed from the perspective of the mold structure. The erosion wear law of fiber particles under different erosion velocity and angle and the comparison of sliding energy of the contact surface were analyzed by the LS-DYNA finite element analysis software. The results show that the fiber particles at the gate were highly oriented along the melt erosion velocity vector, and the erosion volume decreases with the increase of the erosion angle. With the increase of melt erosion velocity, the longer the sliding distance of fiber particles on the contact surface, the more sliding energy was transformed on the contact surface. When the melt temperature was 300&#xa0;°C, the flow rate was 9.26 cm³/s, the gate angle was 45°, and the erosion velocity was 53.59&#xa0;m/s.</p>