The deformation behavior of Al-Zn-Mg-Cu alloy during equal channel angular dual-directional extrusion （ECADE） processing was studied by means of numerical simulation and experiments. The results show that the ECADE process can be divided into three stages: local upsetting, shearing deformation and final filling. Also, the processed sample can divided into undeformed zone, small deformation zone, shear deformation zone and severe deformation zone according to the metal flow and mesh distortion. Different loading ways of the upper and lower punches lead to the deviation of deformation zone, and the sample has less deformation homogeneity along with the more velocity difference between the two punches. The most homogeneous deformation with maximum strain of 3.97 and deformation uniformity coefficient of 1.89 was obtained while the velocity ratio was 1: 1. In addition, the deformation behavior under different routes was investigated. It is found that the deformation is more homogeneous under 4 passes of route B compared with route A, having a 29 % reduction in deformation uniformity coefficient and a 14 % increase in shear deformation zone proportion.