Taking　(Ti40.4Zr27.7Be15.6Cu63)(90+x)/90Nb10-x(x=0,　2,　4,　6,　8,　10,　%)　alloy　as　the　research　object,　four　kinds　of　Ti-based　bulk　metallic　glass　composites(BMGCs)　reinforced　by　in-situ　endogenetic　β-phase　dendrites　were　prepared.　The　phase　composition,　microstructure,　mechanical　properties　and　deformation　behavior　of　Ti-based　BMGCs　were　systematically　analyzed　through　XRD,　SEM　and　TEM.　The　results　demonstrate　that　the　volume　fraction　and　dimension　of　the　in-situ　endogenetic　β-phase　dendrites　in　Ti-based　BMGCs　are　increased　with　the　increase　of　Nb　content.　The　tensile　results　reveal　that　the　yield　strength　and　tensile　strength　of　the　composites　are　decreased　with　increasing　dimension　of　the　in-situ　endogenetic　β-phase　dendrites,　contrarily,　the　plastic　deformation　ability　is　enhanced　significantly.　Among　these　BMGCs,　the　mean　yield　strength,　tensile　strength　and　fracture　strain　of　Ti40.4Zr27.7Be15.6Cu6.3Nb10　BMGC　are　1　307　MPa,　1　428　MPa　and　9.61%,　respectively,　indicating　the　excellent　plastic　deformation　ability　of　the　Ti-based　BMGC.　©　2022,　Journal　Office　of　Special　Casting　and　Nonferrous　Alloys.　All　right　reserved.