In the design of engineering projects, the crosswise deck width of sinle-box multiple-cell wide box girder is often larger than span. The stress is complex. The use of general beam element calcualtion and analysis is hard to effectively and accurately simulate the stress state of crosswise bridge to box girder, in which the shear distribution to the different webs of crosswise bridge is the key point of crosswise stress of multiple-web wide-box girder. In order to study the difference of the shear distributions of the different webs, the solid element finite element model of upper box girder and the related comparison models are established. The analysis result shows that the layout of support will act as a crucial adjective role for the multiple-web shear distribution of wide-box girder.