In this paper，the finite element elastic buckling analysis method was used to study the shear stability of metal webs with different opening diameters. In order to compensate for the loss of stability after opening， the reinforcement effects of common reinforcement rings and flanges under different hole sizes were discussed. The results show that the stability of metal web decreases with the increase of hole diameter. The effect of increasing flange flanging height and thickness to improve web stability is obvious. When the flanging height is 16 mm and the flange thickness is 1.5 mm， the reinforcement effect is the best. This is because the increase of flange flanging height and thickness is equivalent to the increase of stiffness around the opening， and stiffness has a significant impact on web stability.