Abstract: On the basis of seismic informations obtained from analogue magnetic tape,this article gives comprehensive explanation of the various seismic information and the results of drilling and logging in the Qiaobai district in Dong-min Depression.Examples are cited to demonstrate the foundation and methodology of explaining seismic facies analysis,velocity analysis and regional sedimentary facies analysis.New basis is provided for deepening the explanation of the seismic information obtained from analogue magnetic tape,for dividing the lower Tertiary sedimentary facies of this area and for predicting its lithofacies as well.The lithofacies zones favourable for oil and gas accumulation,local structures and the possible sites for planning drill are indicated in the article.