The purpose of this paper was to achieve NC machining the equal base circle bevel gear with a disc cutter.Based on the equal base circle bevel gear theory,through establishing the disc cutter processing coordinate system of a special bevel gear,the main parameters which decided tool's position and posture were solved.By calculating the disc cutter shaft vector and cutter heart coordinates,the calculation results of tool position in the gear blank coordinate system were obtained.Combined with general five ax...