In actual production,similarstructured parts are often produced.A lot of repetitive operations are existed in traditional NC programming method.In order to improve the efficiency and realize the standardization and rationality of NC programming,a templatebased method was proposed to realize the processing program conversion of similarstructured parts.For the extensive application of disc parts in production and processing,it was used as a typical representative to establish a feature template knowledge base of disc parts and the processing of some typical disk parts was saved as part templates.When NC programming was performed on similarstructured disc parts,feature templates or typical part template were called in the template knowledge base based on similar feature matching rules.Finally,the machining surface and necessary machining parameters in the CAM software were changed to realize rapid conversion of NC machining program.Through the practical application,the effectiveness of the method is verified.