Abstract: 30CrMnSiA high-strength steel has high strength, good wear resistance, fatigue resistance, and impact resistance, and is widely used in aerospace and other fields. In order to study the influence of process parameters on milling force and milling temperature of 30CrMnSiA high strength steel, the orthogonal test method was used to carry out milling test. The range analysis, variance analysis and finite element simulation were used to study the milling force and milling temperature, and the empirical formula of milling force was obtained through multivariate regression analysis. The results show that the feed rate has a significant impact on milling force, while the milling width, milling depth, and spindle speed have a smaller impact. Moreover, each milling parameter mainly affects the milling force in the X direction, and has a smaller impact on the Y and Z directions; The degree of influence of milling parameters on milling temperature is as follows: milling depth>milling width>spindle speed>feed speed.