The Carboniferous basement of Gucheng nose-uplift area is a regional unconformity.The extensively developed overlying stratigraphic traps include: 1. Erosion-surface formedchannel-valley system stratigraphic traps. The trap properties depend on basements. It isconsidered that the basement of the Middle-Upper Ordovician is the best while that of theSilurian is secondarys 2. The fringe marginal overlap traps of the nose uplift. Different degrees of erosion result in sandstone overlap and gravel overlap. The former prevails over the later.