Abstract: Seismogeological conditions are complex in the southern abroupt slop zone in Biyang depression. One of the main causes of unsuccessful exploration is that the fault zone reflected on the previous poor seismic profiles is incomplete and ambiguous. In viewing of the problems existed in previous seismic survey, a geologic model is built by using the available data, and the seismic reflection features in the southern abroupt slop zone are studied through forward modeling. A 3D seismic measurement system that is compatible with subsurface geologic conditions and the processing techniques is designed. Its application achieves a remarkably higher signal - to - noise ratio and resolution.