We focus on the electrochemical dissolution characteristics of new titanium alloys such as near-αtitanium alloy Ti60,α+βtitanium alloy TC4andβtitanium alloy Ti40 which are often used for aerospace industry.The experiments are carried out by electrochemical machining tool,and the surface morphology of the specimens is observed by the scanning electron microscope(SEM)and three-dimensional video microscope(DVM).The appropriate electrolyte is selected and the relationships between surface roughness and current density are achieved.The results show that the single-phase titanium alloy Ti40 has a better surface roughness after ECM compared with theα+βtitanium alloy TC4 and the near-αtitanium alloy Ti60.The best surface roughness is Ra 0.28μm when the current density is 75A/cm2.Furthermore,the surface roughness of the near-αtitanium alloy Ti60 is the most sensitive with the current density because of the different electrochemical equivalents of substitutional elements and larger grains than TC4.Finally,the suitable current density for each titanium alloy is achieved. We focus on the electrochemical dissociation characteristics of new titanium alloys such as near-αtitanium alloy Ti60, α + βtitanium alloy Ti40 which are often used for aerospace industry. These experiments are carried out by electrochemical machining tool, and the surface morphology of the The appropriate electrolyte is selected and the relationships between surface roughness and current density are achieved. The results show that the single-phase titanium alloy Ti40 has a better surface roughness after ECM compared with the α + βtitanium alloy TC4 and the near-αtitanium alloy Ti60. The best surface roughness is Ra 0.28μm when the current density is 75A / cm2.Furthermore, the surface roughness of the near-αtitanium alloy Ti60 is the most sensitive with the current density because of the different electrochemical equivalents of substitutional elements and larger grai ns than TC4.Finally, the suitable current density for each titanium alloy is achieved.