In　this　study,　particle　and　short　fiber-reinforced　titanium　matrix　composite　coatings　are　prepared　via　laser　in　situ　technique　using　(0.5　and　50　mu　m)　TiB2　and　Ti　powder　as　cladding　materials.　The　microstructure　and　properties　of　the　composite　coatings　are　studied,　and　the　changing　mechanism　of　the　microstructure　is　discussed.　The　results　reveal　that　particle　agglomeration　is　prone　to　appear　with　using　fine　TiB2　particles.　Decomposition　of　the　particles　preferentially　occurs　with　using　coarse　TiB2　particles.　The　cracks　and　pores　on　the　surface　of　the　coating　are　formed　at　a　lower　laser　energy　density.　With　the　increase　in　the　laser　energy　density,　cracking　on　the　surface　of　the　coating　diminishes,　but　the　coating　exhibits　depression　behavior.　The　depression　extent　of　the　coating　using　fine　TiB2　particle　as　the　reinforcement　is　much　less　than　that　of　the　coating　using　coarse　TiB2　particle.　Moreover,　the　size　of　the　aggregate　and　the　tendency　of　cracking　can　be　reduced　with　the　increase　in　Ti　addition.　Meanwhile,　short　TiB　fiber　bundles　are　formed　by　the　diffusion　mechanism　of　rod　aggregate,　and　randomly　oriented　TiB　short　fibers　are　formed　mainly　by　the　dissolution-precipitation　mechanism　of　fine　TiB2　particles.　Moreover,　the　growth　of　short　TiB　fibers　can　be　in　an　alternating　manner　between　B27　and　Bf　structures.　The　micro-hardness　and　wear　resistance　of　the　coatings　are　evidently　higher　than　that　of　the　titanium　alloy　substrate.　The　wear　resistance　of　the　large　size　TiB2　coating　is　higher　than　that　of　the　small　size　TiB2　coating　under　the　condition　of　low　load.