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According to this phenomenon,with the help of finite element software ANSYS,“single plate bearing” of plate girder bridge is simulated numerically in this section.Firstly models are simulated with beam element,and transversal distribution rule of load is analyzed.Then according to the mechanical behavior of plate girder bridge and the reason leading to “single plate bearing”,five strengthening schemes are proposed to delay or avoid “single plate bearing” and their spatial models are built with solid element Mechanical behaviors such as displacement,stress are contrasted and analyzed.Furthermore transversal stress at hinged joints is analyzed in detail,and it is proposed that the adhesive strength between new and old concrete should be applied to test transversal stress at hinged joints.