Abstract: In this paper,the characteristic seismic parameters of sedimentary facies are calculated from 3-D seis mic data of the study area,the mathematical models of composite sedimentary cycles and single seismic sedimentary subfacies cycles for the upper part of the Guantao Formation(Late Tertiary)in Chengdao oil field are established by means of the Integrated Seismic Parameter Conversion Method and the Monoseis mlc Parameter Method,and the prediction and evaluation on sandbody for sandstone sets and single sand beds are accomplished,respectively.The results yielded are compatible with the practical drilling data ob tained.