A bearing capacity evaluation model of prestressed concrete bridge is established based on analytic hierarchy process. In order to determine the bearing capacity of the existing bridge condition, fuzzy evaluation method is used to evaluate material damage degree of bridge structures, in which of experience of experts can be used sufficiently. The method is evident and useful, which can reflect the prestressed concrete bridge in service effectively, improve the existing structure model and optimize the bearing capacity of synthetic evaluation. At the same time, the result is verified reasonably by an engineering example.