Abstract: In order to alleviate the problems such as high load value and inhomogeneous deformation during equal channel angular pressing（ECAP）, which can improve the mechanical properties of 7XXX series aluminum alloys, ECAP forming process of 7050 aluminum alloy with five different homogenization treatment methods including as-cast, 465 ℃/24h-furnace cooling, 465 ℃/24 h-water cooling, 465 ℃/24 h+475 ℃/4 h-furnace cooling and 465 ℃/24 h+475 ℃/4 h-water cooling were simulated by DEFORM-3D finite element software. The distribution and change law of extrusion load and equivalent strain of aluminum alloys in different states during ECAP process were analyzed. The effect mechanism of homogenization treatment on the ECAP formability of 7050 aluminum alloy was explained. The results show that compared with other states, peak extrusion load under the double-stage homogenization with water cooling treatment is highest as 9.2 t because of the pinning effect to dislocations of fine dispersed phases; peak extrusion load under the double-stage homogenization with furnace cooling treatment is owest as 6.6 t because that the fine dispersed phases are coarsened during the furnace cooling process; the distribution of effective strain under the double-stage homogenization with air cooling treatment is best, and the effective strain difference between the inner corner and the middle position of the material are 0.025,which decreases by about 50%-60% compared with other treatment system.