Abstract: Based on the analysis of seismic data from oil basins in North China,North Jiangsu and South Sea etc., the authors conclude that: (1) making use of seismic data, more hiatuses may be found which are significant to the study of development of oil basins and to the location of stratigraphic oil pools; (2)seismic data serve as the most effective means for determining the direction of paleocurrent. A study of the paleocurrent direction in the three depressions at Banchiao, Yangcheng and Chutang reveals that they were intercommunicated with the surrounding depressions and were controlled by some major current system and(3)the amplitude, frequency, continuity, internal structure of reflections as well as configuration of the reflecting units are the basis for determining the seismic facies and predicting the depositional environment of any prospect before drilling.