Abstract: This invention relates to a method for forming a titanium alloy by powder metallurgy, which comprises the processes of mixing uniformly a powder of titanium or an alloy thereof with a low-melting point metal or alloy powder, injecting the mixture into a press forming die, then press forming them under heating to a temperature near and over the melting point of the low-melting point metal, or to a temperature between the liquidus and the solidus of the low-melting point alloy, or to a temperature near and over the liquidus to obtain the targeted compact, and holding this compact in the pressurized state to cause the molten low-melting point metal or alloy to infiltrate the powder grain boundary of the titanium or alloy thereof, and then sintering the compact thus obtained in an inert atmosphere or a vacuum to diffuse the titanium or alloy thereof and the low-melting point metal or alloy into each other and to make alloys of them.