The importance and recent achievements in the field of noise control of power transformer are discussed.Vibration causes the noises of transformer and cooling system.The far-field radiation noise can be analyzed with statistic method of measured data or with calculating model.The sound intensity method is more accurate than the traditional sound pressure method in measuring radiation noise of a transformer.The methods for controlling transformer noise are introduced: for noise source control

using high-quality silicon-steel sheet

and adopting effective measures in transformer design

techniques and installation;for noise propagation control

adopting muffler device

sound insulation board and isolation booth

etc.to enhance noise attenuation.In addition

the trend of the power transformer noise control is prospected.