For the problems of large forming load, low material utilization rate and long production cycle in the traditional manufacturing process of aircraft landing gear, the backward extrusion process was proposed to manufacture 300M steel landing gear actuator, and the backward extrusion die and blank shape were designed. Then, the finite element simulation was carried out by Deform-3D, and the change laws of temperature, equivalent strain and extrusion force during the extrusion process were analyzed at the extrusion temperature of 1050-1150 ℃ and the extrusion rate of 30-120 mm·s-1. The results show that with the increasing of extrusion temperature or extrusion rate, the temperature of forgings shows an upward trend, but the temperature distribution law remains basically unchanged. The extrusion force in the early stage of forgings extrusion decreases with the increasing of extrusion temperature, and the difference of extrusion force in the later stage is not significant. The initial extrusion load at high extrusion rate is larger, but the curve is more stable. When the extrusion temperature is 1050 ℃ and the extrusion rate is 120 mm·s-1, the extrusion load is basically stable at 6.0×106 N. The average strain differences under different extrusion temperatures and extrusion rates are 4.55% and 3.41%, respectively, and the differences in the proportion and distribution law of equivalent strain amounts are very small. Comprehensive analysis shows that the best process parameters combination obtained is the extrusion temperature of 1130 ℃ and the extrusion rate of 30-50 mm·s-1.