This paper presents a parametric study regarding the buckling analysis of plate girder with trapezoid web subjected to shear loading. The shear buckling mode and ultimate shear capacity of plate girders with corrugated steel webs are analyzed by nonlinear finite elements method. The models of plate girders are simulated by 8-node structure shell element. The simulation was done for the defect of plate girders with corrugated steel web with different imperfections values, and the defects were included in the material nonlinearity and geometric nonlinearity. On this basis, the influences of corrugation configuration, the overall profile dimensions and the steel thickness of corrugated webs on ultimate shear buckling load and buckling mode are investigated. Also, this paper investigate the design equation proposed by design manual for PC bridges with corrugated steel web 1998 and the ability of using it to predict the inelastic shear buckling stresses.