Abstract: by using high resolution sequence stratigraphic theory, ranking sequence stratigraphy is classified in study area. 41 short-term base-level cycles,7 mid-term base-level cycles and 2 long-term base-level cycles(LSC1 and LSC2)are classified in the target of the research area.then reservoir heterogeneity is studied for ranking sequence stratigraphy. The calculation results are consistent with the characteristics of mid-term and long-term base-level cycles and the distribution of sand bodies and the distribution of sedimentary facies. The evaluation results are instructive to the comprehensive adjustments during the middle or late stage of oil-field development. The evaluation methods are significant to the similar reservoir.