In recent years, the enormous progress of aeronautical manufacturing has promoted the superalloy industry little by little, especially the rapid development of nickel-based superalloy industry. The hard processing problem of superalloy material is one of the difficulties of manufacturing. And in the process of cutting, there are some phenomenons, such as large cutting force, high cutting temperature which directly affect the surface quality of workpiece and tool life, and so on. Therefore, the research on measurement and analysis of the cutting force is the effective approach of superalloy cutting processing. This article explores the change rule of cutting force in superalloy cutting by the PCBN cutting tool. Firstly, the material properties and processing characteristics of the superalloy are expounded; Secondly, the single factor and orthogonal tests are designed and conducted, which aim to explore the effect and influence rule of the negative chamfer on the cutting force, then the cutting force prediction model of turning superalloy GH4169 by PCBN cutting tool is established and investigated; Finally, the model optimization is finished and compared with experimental data. The above efforts provide certain reference for superalloy technological parameter optimization.