Abstract:f-k filtering for linear noise removal is one of usual methods for removing noisein seismic data processing.However,the ill use of f-k filtering will result in de-structive effect,namely,causing new linear noises in the seismic section whose o-riginal linear noise has been reduced.The reason why the new noises appear liesthat the oversuppression of original noises in f-k domain makes noise energy unbal-anced.A high S/N ratio seismic section without linear noise and its f-k spectrumare taken as examples to show the difference between full suppression of noise ener-gy and partial suppression of noise energy.It can be easy seen that neither strongnoise belt nor zero noise belt occurs in the f-k spectrum of the former case.Accord-ingly,the conception of noise energy equilibrium is advanced to remove linear nois-es,receiving quite good effect.