In-situ　beta-Ti　toughening　Ti-based　bulk　metallic　glass　matrix　composites　(BMGCs)　have　been　synthesized　by　the　Bridgman　solidification,　and　the　microstructure,　phase　composition　and　chemical　composition　of　this　material　has　been　studied　by　XRD,　SEM,　EBSD,　TEM,　EDS　and　three-dimensional　reconstruction　method.　Based　on　these,　the　deformation　process　was　studied　by　in-situ　SEM,　EBSD　and　TEM.　The　results　show　that　the　crystal　phase　is　dendritic　morphology,　which　has　the　very　good　connectivity　and　the　secondary　dendrite　arm　of　1　similar　to　3　mu　m.　The　chemical　composition　of　dendritic　crystal　phase　is　Ti62.4Zr18.4Cu2.6V16.6　(at%)　and　the　amorphous　matrix　is　Ti45Zr34.8Cu　V-10.6(9.6).　The　volume　fractions　of　the　dendrites　and　the　amorphous　are　61.5%　and　38%,　respectively.　The　crystal　phase　deformation　is　mainly　for　dislocation　multiplication,　and　the　amorphous　matrix　deformation　is　mainly　in　the　form　of　multiple　shear　bands.　In　the　elastic　deformation　stage,　the　dislocation　accumulates　in　two　phase　interface;　in　the　plastic　deformation　stage,　the　{110}　slip　step　forms　to　transfer　stress,　making　the　good　plasticity.