This report deals with the parametric analysis of elastic shear buckling done by F.E.M. program in order to evaluate shear buckling behavior of rectangular corrugate plates accurately. The results calculated by F.E.M. program are compared with those given by existing formula and calculated by energy method analysis and the differences between rectangular corrugate plates and anisotropic plates are examined. Furthermore, using ratio of the moment of inertia, the influences of cross-sectional shapes and boundary conditions of rectangular corrugate plates are understood in some degree, and new approximate formulas to evaluate the elastic buckling strength are suggested.