Abstract: Piedmont tectonic belt is characterized by good trap conditions,which is an important area for hydrocarbon accumulation.But the double-complex seismic & geologic conditions (complex surface and complex underground conditions) cause great trouble in seismic exploration.In order to solve the problem,we build up a set of depth domain and high-precision seismic imaging processing workflow facing the complex piedmont belt.This workflow ties the processing approach on with simulated surface seismic data,and is based on the high fidelity of prestack preprocessing.Depth domain with progressive type velocity analysis and modeling is the key of the flow.Irregular topography prestack reverse-time depth migration imaging is the core of the flow.The actual data processing verifies the correctness of the concept and the effectiveness of the technology used in this paper.Thus it provides a strong technical support for complex piedmont belt of oil and gas exploration.