Abstract: Mesozoic Traps in the west of the East China Sea Shelf Basin are studied in this paper based on systematic structural interpretation of 2D seismic data and analysis of regional geology. It is found that the Mesozoic traps in this region are dominated by structural and stratigraphic traps. The horizontal distribution of the traps depends mainly upon the development of fractures and tectonic deformation. To reveal the spatial distribution pattern of the traps is of significance to further hydrocarbon exploration in the region.