This paper deals with analysis of structures with complex plastic properties of material and based on FEM which was adopted for perfect plastic flow. It is much efficient iterative procedure with initial global stiffness matrix. The complex constitutive law is described by multielements method. It means that the number of elements of equal shape are placed in the same nods mesh in parallel manner as multilayers sandwich. These elements have to be different of elastic and plastic properties. The consistent plastic state of elements make an ability to simulate the very complex plastic behavior. By this way it is possible to simulate hardened and locked materials as the softened one and clear space supports. The multielement idea is very productive for singular solution of strains at crack tip as in elastic as in perfect plastic solid.

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