Aiming at the problems such as poor quality in the conventional processing of high-performance composite armor taking new lightweight ceramic materials as core, the ultrasonic vibration-assisted hole-making technology for SiC/GFRP composite armor was studied. The drilling force was explored through changing the machine tool spindle speed, feed rate etc. The results show that increasing the machine tool spindle speed or decreasing the feed rate, the drilling axial force can be effectively reduced; ultrasonic vibration helps to improve the surface integrity of hole making, which can significantly improve the quality of hole making.