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Studying the microscopic and particle characteristics of Yingcheng Formation reservior in Shiwu oilfield�� the authors identify five microfacies in this area which contain submerged distributary channel��branching mouth bar��distal bar of fan delta front subfacies and subaqueous fan��turbidity current of shallow to semi-deep lake subfacies�� Combined with the reservior property data��it is revealed that sand genetic types evidently controlled the reservoir physical property�� The branching mouth bar and submerged distributary channel of fan delta front are the best in sand reservoir quality��the subaqueous fan is slightly inferior��while the distal bar and turbidity current are the worst�� The reservoir physical property in this area is also controlled by diagenesis��