In order to optimize the milling process and improve the machining quality, starting from optimizing the milling tool and process parameters, on the basis of the ring milling cutter, the milling speed, the feed rate and the milling depth were selected as the optimization parameters,surface roughness as a response indicator, the experiment was designed by using the response surface method, and the variance analysis method was used to process the experimental data and a model was established to analyze the significance and the interaction between the parameters.The results show that the ring milling cutter has better machining effect than the spherical milling cutter, and the milling speed is 147.31 m/min, the feed rate is 0.13 mm/r, the milling depth is 2.04 mm, the surface roughness is 0.74 μm,the processing quality is optimal; the influence of the linear effect on surface roughness is: milling speed>feed rate>milling depth.