Abstarct: Equal Channel Angular Pressing (ECAP) is one of the most effective methods for inducing severe plastic deformation in order to produce ultrafine grained and even nanostructured materials. Among the mextals, aluminum alloys, due to high strength to weight ratio, are used extensively in the aerospace industry, military and medical sectors.By refining the grain size of such materials, this ratio can be increased. In this study, the number of ECAP passes on microstructure and mechanical properties of 7075 aluminum is studied. Samples with circular cross section with a diameter of 12 mm and a length of 140 mm were pressed in a die having circular channels oriented at 90 degrees with respect to eachother. Route Bc was used for all experiments. Samples ECAPed at room temperature were failed by cracking oblique to the axial direction. Therefore, by heating the die, the operation was performed at 130 °C. Samples were successfully warm ECAPed up to 10 passes. The microstructure , microhardness and strength of the recovered samples were studied. The results show that aluminum alloy 7075 has a high potential for grain refinement and thus increase in strength and microhardness in first pass of process. After second pass, the strength was reduced and ductility enhances.