Abstract: Suppression of pre - stack abnormal velocity and random noise are very important in low signal - to - noise ratio seismic processing and high resolution seismic processing. Through combining velocity - based wave field transformation technology with pre - stack noise suppression technology, we transform the corresponding pre - stack trace gathers into new stack gathers that the effective signals can be separated easily, then perform filtration of the corrected CDP trace gather by using linear polynomial multi - stage fitting technology to effectively suppress noise. Theoretical model and real data processing show that this method is viable.