Abstract: Thin-walled parts are prone to deformation during machining due to their low stiffness, which further affects machining accuracy and product quality. In this paper, CAM software is adopted to conduct simulation analysis on the machining deformation of thin-walled parts and optimize the process parameters. Firstly, the basic theory of machining deformation for thin-walled parts is elaborated to clarify the deformation mechanism. Secondly, a simulation platform is established, the geometric model of thin-walled parts is built, the machining path is planned, and deformation simulation results are extracted. Then, key influencing factors of process parameters are determined based on simulation data, an experimental scheme is designed, and a parameter optimization model is constructed to solve for the optimal process parameters. Finally, the simulation results before and after optimization are compared to analyze the sensitivity law of each parameter and evaluate the improvement of machining quality.