This authors investigated the characteristics of the Upper Jurassic sedimentary systems inthe Luxi hollow by using seismic and well logging data．In the Upper Jurassic of this area thereOccur three sedimentary systems，i．e．，offshore underwater fans，deltas and high—horst slopefans，of which offshore underwater fans are distributed most commonly and constitute majod re—serviore in this area and high—horst slope fans are gravity current sediment bodies formed byslumpimg and related to subaqueous paleo-uplift，which constitute special systems in this area．