Abstract: Computer-aided manufacturing (CAM) is a production approach that uses computer software and automated technology to manufacture high-quality, precise items. To increase efficiency and eliminate waste, the suggested CAM approach would design new or adapt existing industrial setups. In order to deal with the problems of less optimization and cumbersome operation of complex and small batch parts in practical machining applications, a development method of AutoCAD-based NC program simulation software is proposed. Firstly, starting from the feature processing method of complex and small batch parts, the processing technology of common key parts in industrial steam turbines is studied, combined with the idea of group processing, through the analysis of processing features, the typical process files are compiled and the docking relationship is established. Then, using the functions of AutoCAD, the generated NC code is simulated and compared with the traditional AutoCAD software algorithm to verify the correctness and rationality of the NC code. This is accomplished by lowering energy consumption and accelerating the production process and tooling. Product planning, development, administration, Storage, and transportation may all be aided by CAM.