To　meeting　the　double　demands　of　structural　weight　reduction　and　performance　improvement　of　aerospace　vehicle,　conventional　high-temperature　titanium　alloys　or　titanium　matrix　composites　(TMCs)　are　encountering　a　huge　challenge　that　the　room-temperature　ductility　will　be　inevitably　deteriorated　in　pursuit　of　enhancing　the　elevated　high-temperature　strength.　The　present　work　proposes　a　feasible　strategy　for　resolving　this　contradiction　by　constructing　a　novel　bimodal　architecture　and　introducing　the　multiscale　reinforcements　of　microsized　TiB　whiskers　and　micro/　nanosized　Y2O3　particles.　The　unique　bimodal　microstructure　consists　of　primary　microsized　alpha　p/beta　lath　clusters　and　micro/nano　basketweave-like　structure　composing　of　alpha　p,　secondary　nanosized　alpha　s　and　beta　laths.　It　is　noteworthy　that　the　bimodal　(TiB+Y2O3)/Ti　composite　exhibits　excellent　mechanical　properties　with　the　ultimate　tensile　strength　(UTS)　of　1318　MPa　with　the　total　elongation　to　failure　(EL)　of　10.5%　at　room　temperature,　and　UTS　of　934　MPa　with　EL　of　23　%　at　600　degrees　C,　far　higher　that　of　the　reported　600　degrees　C　high　temperature　titanium　alloys　or　TMCs.　In-situ　investigations　indicate　the　postponed　strain　localization,　the　activated　extra　(c　+　a)　dislocations　within　alpha　p　laths,　and　the　heterogeneous　deformation　induced　(HDI)　hardening　caused　by　the　unique　bimodal　microstructure,　synergistically　promoted　the　ductility　of　bimodal　(TiB+Y2O3)/Ti　composite.　While　the　strength　enhancement　at　room　temperature　and　600　degrees　C　is　attributed　to　the　synergistic　strengthening　effect　of　nanosized　alpha　s,　microsized　TiB　whiskers　and　micro/nanosized　Y2O3　particles　and　HDI　strengthening.　These　findings　provide　a　new　insight　for　improving　mechanical　properties　of　metal　matrix　composites.