In　this　study,　coatings　are　fabricated　with　laser　cladding　technique　on　titanium　alloy　substrate　using　TiB2　powder　(0.5　mu　m,　5　mu　m　and　50　mu　m)　as　the　cladding　materials.　The　effects　of　different　TiB2　particle　sizes　and　different　laser　powers　on　the　microstructure　of　laser　cladding　layer　are　investigated.　The　results　reveal　that　the　cladding　layer　of　high　aspect　ratio　TiB　fiber　bundle　is　formed　when　using　0.5　mu　m　TiB2　as　the　cladding　material　under　the　condition　of　high　laser　power　(2.5　kW)　of　TiB　fiber　bundle　are　formed　when　using　5　mu　m　and　50　mu　m　TiB2　as　the　cladding　materials　under　the　condition　of　different　laser　powers.　Combined　with　the　evolution　of　microstructure　in　the　cladding　layers,　the　formation　mechanism　of　high　aspect　ratio　TiB　fiber　bundle　is　discussed.　Meanwhile,　the　cladding　layer　of　high　aspect　ratio　TiB　fiber　bundle　exhibits　the　advantages　of　high　hardness　and　high　wear　resistance,　and　the　predominant　wear　mechanisms　of　Tilt　fiber　bundle　are　cutting　and　fracture.