The reflected tensile wave is a main damage mode of materials failure in laser shock processing. The shock test of Al2O3 ceramic was carried on using high power Ndglass pulse laser for further analyzing shock performance of ceramic materials and controlling the demage to improve its toughness. The different damage mode appeared through sticking film on the back of the ceramics. It can be illuminated that the energy of reflected wave is reduced to 40% of that before sticked, and the baleful rupture caused by tensile wave is greatly depressed by lessening reflected energy.