Abstract: Mechanical properties of three types of typical microstructure of TC6 titanium alloy obtained by heat treatment have been determined and proportions of α phase and β phase in different microstructure have been measured by special software for analyzing graph.Effects of proportions of α phase and β phase on quasi-static mechanical properties have been analyzed. Results show that the plasticity increases with the increasing of proportion of α phase,at the same time, the strength decreases with the increasing of proportion of α phase.