Carbon fiber reinforced polymer (CFRP) is a kind of material with epoxy resin as matrix material and carbon fiber as reinforced material, which has the characteristics of high strength, high specific strength and corrosion resistance. CFRPs and titanium alloys are two kinds of lightweight materials widely used in aerospace fields. CFRPs and titanium alloys often appear as laminated structures in the key areas of large passenger aircraft, which leads to a large number of hole-making of CFRP/Ti stacks in the manufacturing and assembly processes of large passenger aircraft. The variation of heat and force as well as chip shape in the CFRP/Ti stacks drilling process will directly affect the cutting state of the tool.Therefore, the study of force-thermal behavior and chip forming in the CFRP/Ti stacks drilling process was carried out in this paper, which has important guiding significance for the actual drilling process of CFRP-Ti stack.