Abstract: Three-dimensional seismic data of the Zhongmachang structural belt in Yanqi basin are influenced by different factors such as seismic acquisition bin and seismic acquisition azimuth. There are gaps or gaps in seismic data in some areas, and the offset is not balanced. The coverage times of the whole work area are quite different, and the amplitude of prestack gather is not balanced, resulting in migration arcing and migration noise, which is not conducive to prestack migration imaging. The application of GEOVATION's data regularization technique effectively solves the problem of uneven offset distribution,improves the signal-to-noise ratio of data, and achieves good results in the old 3 D seismic data reprocessing in Ma 1 well area of Yanqi basin.