Abstract:The Fengshan basin is a well preserved extensional basin in the Yanshan structural belt. There exist various sedimentary lithofacies that show obvious spatial variation. Alluvial fan and fan delta sedimentation dominated proximal areas of the northern and western basin margin, while fine grained lacustrine sediments were prevalent in the basin centre. Sediments were demonstrated to have mainly come from metamorphic basements on the north and west. Tectonic subsidence and sedimentation were primarily controlled by the northern and western basin border faults. Uplift of base rocks of the footwall was due to the tilting of border faults and became main provenance areas. Sedimentary evolution of the Fengshan Basin can be divided into three stages: the first stage is featured by vigorous volcanic eruptions, the second by extensional subsidence and the third by sediment infilling.