Abstract: Stellite6 alloy is a high temperature alloy with cobalt, chromium and tungsten as the main element. It has good red hardness but poor thermal conductivity. During cutting, the contact area between the tool and the chip is easy to produce higher temperature. The cutting simulation model of Stellite6 alloy is established, and the experimental methods and conditions are determined. The influence of feed per tooth, cutting speed and cutting width on cutting temperature is studied by orthogonal test and simulation. The range analysis method and variance analysis method are used to obtain the primary and secondary order of the influence of milling parameters on cutting temperature. The optimal cutting parameters with the minimum cutting temperature as the goal are obtained, and the empirical calculation formula of cutting temperature is established.