Abstract: To study the mechanism of shock wave impacting bubble in vapor explosion caused by high-temperature molten aluminum interacting with water, the process of shock wave impacting underwater bubbles was analyzed by employing the Level set approach in Euler coordinates to track the interface and it could be clearly observed through numerical simulation. Numerical simulations of the interaction process of bubble and shock wave under different initial pressure condition were implemented. The results show that the highest pressure at where the bubble bursts decreases lineally with the increase of the interior pressure of the bubble, and that it also declines with the decrease of the pressure load of the incident plane shock wave.