Abstract: The domal structures are well displayed as an important type of folds in northern Qiangtang Basin,and interpreted to be the products of the superimposition of the nearly NS-trending anticlines created by the nearly EW-trending compressive stress during the phase Ⅲ of the Yanshanian onto the pre-existing nearly EW-trending anticlines.These domal structures are believed to be the most important trap structures in northern Qiangtang Basin.Emphasis in the future exploration will be placed on the domal structures in the nearly EW-trending large- and medium-sized anticlines in order to delineate the targets of oil and gas exploration in the favourable zones.