Abstract: Study of dynamic behaviors of gas bubble in single bubble sonoluminescence is very important.Based on the vibrator model and the law of energy conservation, the Rayleigh-Plesset equation is derived for a bubble radially vibrating in an incompressible and weakly viscous liquid.Curves of R(t)at different driving acoustic pressures are calculated numerically with the Ronge-Kuta method.The effect of energy concentration of bubbles in the collapsing phase is discussed.