Abstract: The method of equal channel angular pressing(ECAP) was used in the deformation of the as annealed copper.The microstructure,corrosion morphology and corrosion resistance property of as annealed copper and the copper prepared by ECAP were contrastive studied through the optical microscopy,SEM and corrosion experiment in four solutions.The results show that after ECAP the grain size of the copper decreased and distributed more uniform with the increase of the pressing time and the mass loss rate of the copper in different solutions by ECAP decreased rapidly.The corrosion resistance property of the copper deformed by ECAP was better than the annealed cooper.