Abstract: In order to diminish drilling damage of glass fiber reinforced polypropylene composite (GF/PP) and improve its drilling efficiency, thrust force and outlet temperature during drilling GF/PP composites for various feed rates were measured by drilling experiments, and outlet processes of drilling were instituted observed with high-speed photography equipment. Outlet material removal process and damage mechanisms were demonstrated. Effect of feed rates on GF/PP composites drilling damage was analyzed. The results show that the outlet drilling temperature is high with low feed rates and becomes relatively steady as feed rates increasing; Outlet tearing is mainly outlet damage and caused by the tearing of large burrs by the cutting edges; It becomes severe with a too high or low feed rate. 0° burr is serious with low feed rates; Inlet tearing is serious with high feed rates.