Abstract: Cast and rolled Al were deformed by equal channel angular pressing (ECAP).Microstructure before and after ECAP were observed and hardness of the materials were measured.The grains in the materials could be remarkably refined by ECAP and there is no obvious difference between the deformed microstructure of specimens which had different initial states.The Vickers hardness of the materials increased after 1st pass during ECAP process and the increasing trend become slower in the following passes.The initial states have no obvious impact on the microstructure and mechanical properties of the materials during ECAP process.