To tackle power interference in seismic record, the authors use S transform which can provide each frequency with the instantaneous amplitude and instantaneous phase so as to obtain the power interference amplitude and phase by using S transform in the timefrequency domain and get the power interference. In this way, the power interference can be reduced. Synthetic seismogram and actual seismic data processing show that this method can achieve good results, no matter whether the interference is a fixed amplitude and phase of power interference or a timevarying amplitude and phase of power interference.