Equal-channel angular pressing (ECAP) is one of the methods of severe plastic deformation for producing ultra fine-grained material. During the multi-pass ECAP process the accumulated plastic deformation creates microstructure of equiaxed fine grains with high angle grain boundaries. This structure is mostly depends on the mechanical scheme of process. This paper analyses the influence of the die geometry, the friction condition between the die and workpiece and the number of passes for the distribution of plastic deformation. Two-dimensional elastic-plastic finite element analysis of ECAP was done. It was suggested a numerical parameter in order to estimate the inhomogenity of the strain field. The modelling results of annealed pore cooper workpieces demonstrate the even-numbered passes can be reach more homogeneous distribution than odd numbered ones.