Abstract: Adopt the method of numerical simulation and experiment to study the metal flowing law in dual equal channel extrusion process ,dual equal channel extrusion technology can cause severe shear deformation within the material, lead to grain refinement and deformation strengthening effect, and the deformation process should be control by adjusting the coefficient of friction. By four passes extrusion 6061 Alloy within A, B path respective, dual equal channel extrusion has strong effetive strain, and at the same passes, path B have great strain strengthening ability than path A.