Abstract： The collapse under the effect of the two kinds of boundaries was simulated by using the numerical method, coupling the volume of fluid multiphase method and cavitation model, and changing the distance from the single air bubble to the vertical wall and the surface of the water.  In the earlier stage, the shape of bubble was mainly affected by the surface of the water and the upper surface of bubble was sunk. In the final stage, the influence of the wall became notable and the sunken direction pointed to the wall gradually. The closer the distance between the bubble and the wall, the shorter the collapse lasts. While the nearer the distance between the bubble and the surface of water, the longer the collapse continues. The distance between the bubble and the vertical wall determines the peak of pressure on the vertical wall.