Abstract: The water curtain system plays an important role in the underground water-sealed oil storage cavern project to meet its containment property, especially to stop the seawater intrusion in the cavern in coastal area. In this paper, the influence law of four parameters of vertical water curtain hole distance from the storage cavern(d), vertical water curtain hole spacing(b), vertical water curtain hole length(l) and vertical water curtain hole injection pressure(pi) on the groundwater seepage field, containment property, water inflow and seawater distribution range around the cavern are analyzed based on an underground water-sealed oil storage cavern in coastal area. The research shows that: the degree of influence of different vertical water curtain hole parameters on the groundwater seepage field around the cavern is in the following order: b