Abstract: Taking the structural calculation on the continuous rigid frame bridge on the access road of a power station as the engineering background, through the analysis of the bearing capacity of the bridge under the special heavy load vehicles, and the comparison of the height changes of the compression zone on the bridge structure under different load conditions, the paper puts forward the analysis method on the bending bearing capacity of the normal section, which provides a reference for the bearing capacity analysis for the continuous rigid frame bridge under the transportation of large pieces.