Abstract: F92 heat-resistant steel is difficult to be machined.A series of milling experiments were designed to analyze the milling mechanism of F92 heat-resistant steel,as well as the influences of cutting speed,feed rate and cutting depth on the cutting forces,roughness of surface and tool wear.A group of optimized milling parameters were obtained to get high efficiency and machining accuracy.The results show that the cutting force (<170 N) was small and the milled surface had low roughness (Ra<0.4 μm) when cutting speed was 94 m·min-1 and feed per tooth was 0.06 mm and the milling depth was 7.5 mm.The main modes of tool wear were coating flaking off and abrasion by abrasive grains.