Deformation capacity of H-shaped steel members subjected to bending with and without axial thrust were investigated. By combining a simplified moment vs. deflection relationships with the local buckling critical stresses of H-sections which were statistically evaluated from the stub-column test results, the deformation capacity of members were predicted. Tests were carried out to observe the deformation capacities of beam and beam-columns which were governed by local buckling. By this method, the limltation of width-thickness ratio to secure deformation capacity required are suggested.