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In this paper the preparation technique of surface nanocrystallization in commercial pure titanium was carried out by sudace mechanical attrition treatment (SMAT). The mean grain size was calculated by using X-ray diffraction (XRD)and transmission electron microscope (TEM), and the results showed that the mean grain size of the surface was refined to nm level after SMAT treatment. Nanocrystallized surface layers were formed after treated for 5, 15, 30 and60 min. Microhardness experimental results implied the microhardness obviously increased on the surface layer and it also showed the variation of microhardness at the cross section. Corrosion test results showed the corrosion resistance of the surfaces in the original commercial pure titanium treated by SMAT was not improved in HCl solution. The corrosion micrographs were observed by scanning electron microscope (SEM).