It is a key point that the surface machining feature plays an important role on machined surface morphology of high speed milling hardened steel. The machining surface morphology surface morphology plays an important role in the formation of surface roughness. In this work, the machining features are the target that find the law of effect on surface morphology. We experiment on the concave and convex surface respectively, find out the influence law of surface morphology with different machining features in the process of high speed milling hardened steel. The results show that. The residual height is lowest along a sinusoidal line, it is times in vertical direction, and it is the worst in the 45odirection. The curvature radius influence the residual height , but the effect in the convex surface is more significant than that of concave surface. By changing the Angle can effectively relieve the effects that the curvature radius influences on surface residual height.