Abstract: Two kinds of coated Cemented carbide tools were used to mill Iron-based superalloy GH2132 at high-speed under dry cutting condition.Wear patterns wear observed by SEM,the main mechanism of tools were analysed,Resultsshow that flank wear is the main wear pattern;the coating of KC725 is made from TiN and TiAlN,so it is more easy to flake;the coating of KC525M is made from only TiAlN,it is not easy to flake,but groove wear was find at cutting edge because of Mechanical impact,the formation of stress concentration leads to more bigger wear at cutting edge.No matter KC525M or KC725M the felting phase is intenerated for the instantaneous heat collection in the cutting section,which leads to the falling of the rigid phase grains and serious abrasion of the base body.The results might be helpful to guiding the design and selection of tool materials and control of tool wear in high speed machining processes.