Sealing ring is a component having higher application requirements with special structure, which can be widely used in many applications. According to material, structure and machining requirements of sealing ring, the high-speed cutting machines were selected by analyzing the characteristics of PoweMILL, then the clamping method of sealing ring with process head was designed. The main machining tools and cutting parameters of sealing ring were determined though process analysis and related cutting experiments. NC programmings were completed by special part of PowerMILL, including roughing, semi-finishing, finishing and clean up machining. Taking sealing ring stiffener as example, the NC programming strategy selection and tool path optimization process were analyzed in details, by which high speed and precision machining of sealing ring was achieved.