The parameter of filling expanding ratio n, plasticity factor k1 and deformation parameter k 2 is raised, and then the elasto-plasticity critical corrosive ratio model for RC structure corrosive expanding crack based on elasto-plasticity theory is constructed in this paper. The influences of parameters such as filling expansion ratio n, plasticity factor k1 , deformation pa-rameter k 2, Poisson ratio of concrete v, diameter of reinforced bar d and protective layer thickness c on the critical corrosive ratio are researched by theory analysis and experiments. The experimental results validate the accuracy of the model. According to the ex-perimental study, the least squares solution is calculated as n = 1.8, k1 = 0.61, k 2 = 0.5.
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