The Usu Bridge is single cable plane single tower cable-stayed bridge, the finite element program is used in this paper, the tensile、compression damage model of Concrete Materials is adopted, the damage of concrete structures of Usu main bridge under the combination of four kinds of static load is calculated, we get the damage distribution of the main tower and the main beam、the location of maximum damage and the effect of loading conditions, from which we find that the change of temperature has a greater impact on their damage and the role of the extreme wind has a greater impact on the main tower, thus we propose reasonable proposals on the construction and maintenance of the bridge.