Abstract: Taking Hebei Fengning pumped-storage power station upper and lower reservoir C30W12F400 panel fiber concrete of as a case,this paper discusses the influence of different stone powder content,mixed with polyacrylonitrile fiber or not on concrete mechanical properties,and it comes to the conclusion that the stone powder content in the sand has enormous influence on the concrete water consumption,strength and other properties,it suggests that the stone powder content should be control in（10＋2）%;Polyacrylonitrile fiber used properly can improve the crack resistance of concrete,it also can make the concrete compressive strength and splitting tensile strength increases obviously.