Abstract: Based on a corrugated steel web cable-stayed bridge as an engineering background，solid finite element model and the truss model were established. Based on finite element analysis，the shearing lag effects were analyzed with the main construction stage and key cross section，through the analysis it was found that the shearing lag effect in the process of the main girder construction was obvious，the shearing lag coefficient of the anchorage cable area was the largest，and the shearing lag coefficient of the internal web was larger than that of the middle and the external web；Compared with the construction process，the shearing lag effect of bridge formation was not obvious and the baseplate was weaker than the roof. According to the characteristics of the girder shearing lag effect，we should consider the effect of this kind of shearing lag effect of girder fully，and the stress safety factor should be taken into consideration while designing this type of box girder with truss analysis program.

Key words: corrugated steel web, shearing lag effect, simulation analysis, mechanical property