In this paper,first,the electrochemical corrosion behaviors of titanium alloy Ti6Al4V were investigated in such different solutions as NaCl,NaBr and KBr at various mass fractions (6. 5%,12. 5% and 18. 5%),and the corresponding corrosion polarization curves and dynamic parameters were obtained.Then,the electrochemical corrosion mechanism of titanium alloy was explored by means of SEM.Finally，the fractal feature of corrosion pits was obtained by means of the pixel-covering fractal dimension method,and the relationship between the corrosion sur- face topography and the fractal was revealed.The results show that (1) different from the titanium alloy in NaBr and KBr solutions,the titanium alloy in NaCl solution possesses wider activation range and longer oxidation dissolution time; (2) the corrosivity of titanium alloy in NaBr solution is stronger than that in NaCl and KBr solutions at the same mass fraction; and (3) the fractal dimension of titanium alloy in the three kinds of solutions gra-dually changes with the increase of mass fraction; for instance,the fractal dimension in NaBr solution is the most，which results in the most complex topography,while that in NaCl solution is the least,which results in a relatively flat topography.