In　this　work,　the　surface　of　the　bamboo　fibers　(BF)　was　treated　with　three　kinds　of　silane　coupling　agents　terminated　with　amino　functional　groups　(KH550),　epoxy　functional　groups　(KH560),　and　methyl　functional　groups　(KH570)　to　improve　fibermatrix　adhesion.　The　effects　of　silane　treatment　on　the　mechanical　properties　and　thermal　behavior　of　BF/polypropylene　(PP)　composites　were　investigated.　Mechanical　test　results　showed　that　the　order　of　modification　effectiveness　was　KH570　＞　KH550　＞　KH560.　KH570　treated　fiber　composite　exhibited　the　best　mechanical　properties.　The　tensile　strength　and　flexural　strength　of　5　wt%　KH570　treatment　reached　to　36.1　and　54.7　MPa,　which　were　15.4%　and　23.6%　higher　than　those　of　UBF/PP　composites.　Simultaneously,　the　thermal　stability　increased　from　467.0C　(UBF)　to　470.6C　(KH-570　treated　BF).　An　increase　in　crystallization　temperature　(1.7C)　and　a　decrease　in　crystallinity　(5.8%)　occurred　upon　the　addition　of　5%　KH570　silanes　treated　bamboo　fibers.　©　The　Author(s)　2020.