Abstract: On the basis of analysis on the lithological property, physical property,electrical property and development per- formance of massive Mesozoic sandstones in Wangguantun Oilfield,Huanghua Depression,it is concluded that the pelitic intercalation,calcareous sandstone and calcareous glu- tenite intercalation were deposited in the study area.By framing up the crossplot of shale content,SDT and resistivi- ty,an intercalation recognition mode is established. Through above study,intercalations in whole study area are recognized and classified as three types of intercalations:sta- ble,sub-stable and unstable ones.The roles and effects of each type have been analyzed during the flood development, which can help optimize the reservoir modification plan.