<p>Stiffness degradation of hinge joints and main girders is common damage in multigirder bridge systems. If these damages are not detected and reinforced in time, the load transverse transmission ability of a multigirder bridge will be reduced, which will lead to unbalanced load distribution and the failure of the girders. To solve this problem, this paper proposes a joint diagnosis method of girder and hinge joints damage of multigirder bridges based on moving load test and field identified influence surface. Firstly, an applicable influence surface identification method is developed using the time-spatial coincidence approach of vehicle location and bridge responses. Then, based on hinge-jointed plate method, the relationship between influence surface, hinge joints shear stiffness and girder bending stiffness is established. Two damage indexes: the hinge joint damage index based on field-tested versus theoretical influence surface differences, and the girder stiffness degradation index derived from their integral ratio, are constructed. Finally, the proposed method is verified through a prefabricated hollow slab beam bridge moving load testing and damage identification example. The proposed method can effectively identify typical damages of multigirder bridges in the early stage, which can guide the reinforcement and management of such bridges.</p>