Following the method of Rayleigh equation and taking into account the parameters of the bubble, the movement equations of the bubble which is seen as a liquid load of the oscillator are obtained. The differences of the equations of single and double bubbles are analyzed. The curve relationships of both equations are simulated by using the Matlab methods. The results show that different parameters have great influences on the movement of the bubbles and are directly related to the effects of the acoustic cavitations, while the movement status of two bubbles are connected with the distance between them.

cavitations； ultrasound； double-bubble； equations of motion