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In order to improve the accuracy of roll flattening calculation based on semi - infinite body model,a more accurate roll flattening model is proposed in this paper,which is derived based on boundary integral equation method.The displacement fields of the finite length semi - infinite body on left and right sides are simulated by using Finite Element Method ( FEM) and lateral displacement decay functions are established.The new roll flattening model is applied in 4Hi mill deformation calculation and compared with Foppl formula and semi - infinite body model in different roll shifting value and bending force.The results show that the pressure and flattening between rolls calculated by the new model are more precise than other two models,especially near the two roll barrel edges.