In composite drilling, decreasing thrust force can help suppress the hole wall sub-surface damage and reduce hole-exit delamination damage . As such, minimizing thrust force is considered a way of improving hole quality. Material removal rate (MRR) on the other hand, characterizes the machining efficiency of the drilling process, hence is preferably maximized. Here, the thrust force, hole-exit delamination damage factor Fda and MRR are the three optimization objectives considered in this study and multi-objective optimization is conducted to identify a set of solutions to achieve the global optimization (trade off) between hole quality and the machining efficiency. Additionally, Fda and Tmax should be constrained to ensure the delamination and thermal damage are within acceptable range . The objective functions, constraints and design spaces for the composite drilling optimization can be expressed as follows: