Linshang fault is one of the NE-striking faults which control the Huiming Sag in the Bohai Bay Basin. The authors tried to analyze the activity of these faults for understanding differentiation of the Huimin Sag after the depositing of the Member 3 of the Paleogene Shahejie Formation. By analyzing the fault geometry, activity of different stages and segments of the Linshang fault, and the related Cenozoic structural evolution of the Bohai Bay Basin, this paper gets some conclusions.