Abstract: For the problem of strip deformation during tension leveling, a mathematical model was proposed based on the plate bending theory. The Mises yielding criterion, elastic perfect-plastic material, plane strain assumption and the assumption of cross section keeping a plane were used during modeling. Limitations, which appear in previous similar research based on the beam bending theory, did not exist in the proposed model. By the proposed model, stress and strain in the thickness direction could be calculated, and strip deformation during tension leveling could be characterized more accurately. Calculation results of an example show that that the proposed model based on the plate bending theory agree with fact much better than the model based on the beam bending theory.