Abstract: Aiming at the influence of the NC machining craft parameters on the cutting force of the aero-engine precision forging blade tenon, the cutting force experiment and analysis of the aero-engine precision forging blade tenon were carried out. Firstly, according to the characteristics of the precision forged blade tenon, the appropriate milling method is selected, and the corresponding mathematical model is established. The mathematical expression of the cutting force of the tool for the precision forging blade tenon is obtained. Secondly, through the modeling and analysis of the cutting force parameters of the milling process parameters, the sensitivity prediction of the cutting force to the milling craft parameters is calculated, and the influence of the cutting depth on the cutting force is most obvious. Finally, the cutting force test is carried out by the three-axis CNC machine tool and the self-built test system to understand the interaction law between the evaluation index and the influencing factors, and the results of sensitivity prediction are verified by the analysis of the cutting amount. It provides a basis for the selection of craft parameters for precision forging blade tenon milling process.