In order to ensure the high surface quality and high dimension precision of the helicopter landing gear wheel shaft after spraying tungsten carbide coating. In this paper, the research on tungsten carbide coating grinding technology for wheel shat is carried out from three aspects of grinding strategy, clamping tool and grinding strategy. First, we used the orthogonal experimental method to find out the grinding parameters that could make the surface roughness of the parts reach Ra0.4; Then, the problems of ellipse and taper in the process of outer circle grinding are eliminated by improving the fixture, adjusting the way of grinding wheel feed and improving the grinding strategy; Finally, the outer circle dimensions of 15axles were collected and calculated, and the process capability index was not less than 1.33. The feasibility and stability of the whole grinding process are proved.