In order to investigate the micro-milling performance of FeCoNiCrMnAlx(x=0,0.6,1) high-entropy alloys,the effects of different process parameters such as spindle speed,feed per tooth,and milling depth on their micro-milling force,cutting specific energy,and surface roughness were investigated by single factor experiment.The results show that Al1 alloy has the largest milling force and the worst surface quality; Al0 alloy has better machinability due to lower milling force,cutting specific energy and surface roughness; the micro-milling force and surface roughness of the three alloys increase firstly and then decrease with the increase of spindle speed and feed per tooth,and increase with the increase of milling depth.In order to reduce the milling force and surface roughness of the alloy,the spindle speed and feed per tooth can be appropriately increased,and the milling depth can be reduced.