Abstract: On the basis of the early days experiments, the relation of the increments of stress to the increments of strain is proposed for the two way forced elements of masonry by assuming orthogonal anisotropy materail in the directions of mortar joint and the matrix of stiffness is presented which represents the increment relation in the directions of main stress by translation of elastic constants of orthegonal anisotropy mater-ail. The nonlinear analysis model of the elements of masonry is used to calculating the wall beams. It has been shown that the calculated results are approximately to those agree with the tested.