The ZrO₂ ceramic sample has been shocked by laser pulse with 35 J energy and determined with scanning electron microscope (SEM) for researching on the impact toughness. The results show that a compact layer with 90 μm thickness that there is no cracks in is formed in the laser irradiated surface of the sample,and a lot of micro-cracks which its density increased as nearing to the back were observed under the compact layer,while the spallation occurred in the back of the sample. The X-ray phase analysis for ZrO₂ ceramic indicate that the impact phase transition from tetragonal phase to monoclinic phase has occurred in some materials,which may lead to the volume of metallographic structure increasing. The residual stress produce by the transition in the tip of cracks will hinder cracks expanding,so the cracks have no expandability. A ceramic sample has been shocked by laser pulse with 10 J energy repeatedly,and then shocked by laser pulse with 42 J energy,the pretreatment results show that the spallation tendency appears in the sample back,but no spallation occurred in there,so it suggests that the laser shocking pretreatment can increase the impact toughness.