Abstract: Applying the high-resolution sequence srtatigraphy,the structures and distribution of the long,middle and short term base level cycles in Hanjiang-Zhujiang formation of Huizhou sag in Xijiang 24-3 oilfield are described in detail.And two long-term and four middleterm base level cycles are identified.The high-resolution sequence stratigraphic division and correlation result in the construction of the isochronous stratigraphic framework of Hanjiang-Zhujiang formation,the analysis of the depositional evolution,and the combination of source bed,reservoir and caprock in the study area.