In this paper

progress in study on capacitor audible noise at home and abroad is described.Some aspects are mainly introduced

such as: the mechanism

the measurement methods（hammer-excited method to get capacitor natural vibration characteristic and estimation method while the measuring point is far away from the source）

the influencing factors（space between the capacitor plates

impregnant

heat treatment

high frequency harmonics

and capacitor capacity）

the countermeasures as well as comments on the results and existing problems.