In order to solve the problem of the optimization of the external grinding process parameters of 300 M high strength steel in the landing gear of a certain type aircraft, the grinding process of the material was studied. The relationship among grinding force, grinding temperature, surface roughness and grinding were established. The optimum parameter range of 300 M steel grinding process was obtained. The results show that the grinding depth should be small when using the white corundum grinding wheel to sharpen the high strength steel. When the component speed decreases, the temperature of the grinding arc decreases, the heat transfer rate decreases, and the temperature of the parts is raised. When the grinding capacity is 300 mm3, the grinding wheel wear is very serious, the chip is scattered and the area is enlarged, which is nearly 1/3 of the grinding wheel face and the adhesion phenomenon occurs.