Reasonable planning process can effectively improve the machining quality and the utilization rate of CNC machine tools. Taking C0N00301 rocker shell of a coal mining machine as an example,by analyzing its structure characteristics and processing technology requirements, machine tool equipment was determined,the positioning fixture program,CNC machining process, machining tools, cutting parameters and the tool paths for different processing characteristics and so on were designed on the KCR160 machining center.The virtual machining simulation verification was carried out in the VERICUT NC machining simulation system.It is proved that the designed NC technology can meet the processing requirements of the parts.