Abstract: In the designed experimental system of laser-generated bubble near a rigid boundary in water,The effect of air content on cavitation erosion was studied by changing the air content and using high speed camera system. The experimental results indicate that the maximumsize of the first cavitation bubble collapse increases with improving the air content in water. Improving the air content may increase the period of the cavitation bubble collapse, weaken the strength of the cavitation bubble collapse, reduce the micro liquid jet velocity, decrease the shock wave pressure to the rigid boundary, and reduce the cavitation damage on the surface of the rigid boundaries.