To optimize the parameters of high-speed milling of aluminum alloy 7055 and provide a theoretical basis for cutting temperature control, a finite element model of high-speed milling process of aluminum alloy 7055 was developed with AdvantEdge. Based on these models, the effect of milling parameters on cutting temperature is investigated by single factor experiments. And the temperature distribution of workpiece and cutting tool is predicted. The results show that the highest temperature occurs at close to the tool tip in the rack face, the temperature increases with an increase in cutting speed and feed per tooth, while other parameters have a less significant effect on cutting temperature.