Abstract: Through comprehensive analysis of drilling,logging and seismic data of Zaobei block in Fenghuadian oilfield,by application of high resolution sequence stratigraphy theory,identification and comparison of multi-grade base level cycle have been carried out,25 ultra short term,9 short term,2mid-term base level cycles have been identified.Studies indicate base level cycles have obvious control effect on sedimentary characteristics,sand body distribution,sand body thickness,and etc,and the thickness of sand body and reservoir physical property is closely related to the location of the base level cycle within.