The vacuum impregnation process is extremely critical in the process of all-film shunt capacitors production.It is shown by the study that a perfect vacuum impregnation process of all-film shunt capacitors is closely related not only to the three critical parameters of the process such as temperature

vacuum degree and time

but also to environment vibration（using ultrasonic wave）.In this paper

the feasibility of applying ultrasonic wave to the vacuum impregnation process of power capacitor is preliminary discussed with hope of improving quality of all-film shunt capacitors.