The　influence　of　prior　cold　deformation　after　solution　treatment　on　the　a　phase　precipitation　behavior　during　the　subsequent　aging　treatment　and　final　mechanical　properties　of　TB3(Ti-10Mo-8V-1Fe-3.5Al)　alloys　was　investigated.　In　the　predeformed　samples,　network　patterns　were　observed　after　aging　treatment　by　metallographic　microscope.　Transmission　electron　microscopic　(TEM)　observation　shows　that　in　the　predeformed-aged　samples,　the　plate-shaped　a　precipitates　prefer　to　nucleate　and　grow　in　high　density　dislocation　sites,　such　as　grain　boundaries　and　slip　bands.　In　addition,　variant　selection　effects　were　observed　in　these　samples.　Results　of　X-ray　diffraction　and　metallographic　microscope　indicate　that　a　phase　precipitation　process　could　be　accelerated　in　predeformed　samples.　Tensile　test　results　reveal　that　by　cold　deformation　the　aging　time　could　be　shortened　and　the　tensile　strength　could　be　enhanced,　while　the　ductility　could　be　reduced,　in　comparison　with　the　freely　aged　sample.