A　new　high　strength　metastable　beta　titanium　alloy(Ti-B20)　was　designed　according　as　the　principle　of　＇near　critical　molybdenum　equivalent　and　multicomponent　strengthening＇.　The　effect　of　solution　treatment　on　aging　response　of　the　new　alloy　including　room　temperature　tensile　properties　and　microstructures　were　investigated.　It　is　found　that　the　tensile　strength　increases　with　the　increase　of　solution　temperatures　on　the　same　aging　conditions　and　water　quenching　from　solution　temperatures　can　produce　higher　age　hardening　effect　compared　with　air　cooling.　The　results　reveal　that　the　specific　aging　response　of　the　new　alloy　is　from　the　low　stability　of　metastable　beta　phase　together　with　the　effect　of　excess　vacancy　on　precipitation.