With　the　aid　of　Kβ　calculation　of　β　stability　parameter　for　Ti-based　alloys,　four　kinds　of　biomedical　Ti-based　alloys　with　different　components　and　compositions　were　designed　and　prepared.　All　these　Ti-based　alloys　had　a　Kβ　value　of　1.0~1.5,　and　theoretically　belonged　to　a　near　β-type.　It　was　clearly　revealed　by　means　of　X-ray　diffraction　and　back-scattered　electron　imaging　that,　of　the　four　alloys　prepared　for　biomedical　application,　ternary　alloy　Ti-25.6Nb-19.4Ta　(%,　mass　fraction)　was　the　most　homogeneous　β　alloy.　For　Ti-25.6Nb-19.4Ta　alloy　in　states　of　as-cast,　solid　solution　and　aging　treatment　at　400°C　for　different　periods　of　time,　hardness　testing,　compression　deformation　and　transmission　electron　microscopy　observations　were　carried　out　to　reveal　and　analyze　the　corresponding　property　and　microstructure.　The　results　showed　that　the　precipitation　of　α-　and　ω-phases　could　lead　to　significant　variations　of　hardness,　strength,　elastic　modulus　for　the　Ti-25.6Nb-19.4Ta　alloy　subjected　to　aging　treatment　at　400°C.　The　close　relationship　between　the　properties　and　microstructures　could　be　revealed　from　these　variations.　©　Right.