The complicated piedmont belt is the main field for oil and gas exploration in new exploration regions of West China. The particular surface geological conditions and complicated deep geological structures of these regions cause outstanding problems such as static correction, complex seismic wave field and low SNR seismic data. Aimed at solving these difficulties, this paper puts forward the design of seismic geometry in western piedmont belt, which is based on the comprehensive real surface model with pre-stack imaging effect in combination with the design technology for the observation system of CRP analysis technology. This technology was used in Hashan 3D block for optimization design of the observation system, with fairly good results obtained.