To nickel base superalloy in dry cutting, the milling experiment be done in the four-axis machining center with ceramic tool WG300 is in order to know the influence of cutting speed to chip morphology through the macroscopic observation on chip by optical microscope and the analysis of chip morphology. Then, focus on the machining features of GH3039, reasonable orthogonal test be designed, after which getting the influence of different level’s value to milling force and its change law based on the range analysis of experiment datum.