Abstract: The 3D seismic exploration and VSP are both relatively mature exploration technique, while the 3D- VSP is a new seismic exploration method, which integrates 3D seismic acquisition and VSP. Through the effective analysis of its data- gathering design and approach, frequency spectrum, signal - to - noise ratio and wave field, the precision of seismic section is effectively improved. In this way, it provides foundation for confirming structure, enlarging and finding traps, defining reservoir types and hydrocarbon development evaluation. Good geological effectiveness has been acquired through the application in Biyang sag.