ZL109 aluminum alloy makes the tools wear seriously,and it is very difficult to obtain high precision.Tool geometry has an important influence on the cutting force,cutting temperature,surface quality and tool life.Optimizing tool geometries is an important significance.The Johnson-Cook constitutive model parameters of ZL109 were tested by using materials testing machine and split hopkinson pressure bar apparatus.The influence of tool rake angle,clearance angle and nose radius on cutting force and peak tool temperature was simulated and analyzed by single factor design in the test.The simulation results have shown that nose radius is the most significant factor to cutting force in X and Y direction,rake angle is the most significant factor to Z direction cutting force,clearance angle is the most significant factor to peak tool temperature.Through the analysis of orthogonal test and range, the tool gets the best performance when rake angle is 0°,clearance angle is 7°,and nose radius is 0.4 mm.