With the development of urban traffic, super-wide steel box girders are widely used in the construction of long-span bridges because of its light weight and beautiful appearance. In order to accurately understand the influence of the cross diaphragm and suspender on the shear lag effect of the self-anchored suspension bridge, this paper based on the experiment results of the Cheng Du Yun Long Wan Bridge, using the ANSYS finite element analysis software to establish a multi-scale structure model and refined analysis, and study the influence of diaphragm and suspender on shear lag effect of steel box girder under different loads. The results show that: (1) Under the different loads, the stress of the roof which at the section with cross diaphragm is less than which without diaphragm, so setting the diaphragm is beneficial for the bridge deck. (2) The stress of the roof which with suspender is less than which without suspender. (3) The thickness, number and distance of diaphragm have effect on shear lag effect.

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