Abstract：Random noise is unavoidable in seismic exploration. The existence of random noise in prestack seismic data not only lowers S/N ratio of seismic data but also decreases the accuracy of dynamic and static corrections，harming final data quality.Many methods for attenuating random noise have received good effect in real applicanon. They were developed by using poststack mathematic model，so that their effects in prestack application are restricted in some degree because of their own theoretical bases or some specific characteristics of prestaek seismic data. Consequently，the method based on dominant component resconstruction has been put forward，which attenuates random noise desirably and protects the residual static correction values of prestack trace gathers，thus improving the accuracy of residual static correction to preserve the high frequency contents of seismic data.
