Abstract: D6AC high-strength steel has high strength and good toughness, and is a difficult-to-process material widely used in many fields. In this paper, from the perspective of achieving efficient cutting of D6AC high-strength steel roughing, the orthogonal test method is used to study the significance of the three elements of the cutting amount on the cutting force during its efficient turning processing, and the order of significance of each cutting amount on the cutting force is obtained by using extreme difference analysis and grey correlation analysis according to the test results, and the empirical formula of each cutting component force and cutting combined force is established and tested. The results show that the empirical formulae for cutting forces have good accuracy.