The stress-strain test on the frame of plate shears is accomplished with DH3816 static strain gauge and 45° rectangular rosette. Fifteen testing points are arranged at the four corners of the cylinder mounting holes on the frame, throat fillet, bearing hole, front vertical plate and lower area of workbench, where larger stresses and displacements occur. Four specifications of shear plates are tested according to four different thicknesses and lengths of sheared plates. The test strain are calculated into stress based on the formulas as follow