The　carbon　fibers(CF)　were　pretreated　with　H3PO4/HNO3,　and　the　acid-treated　CF　was　obtained.　After　that,　acid-treated　CF　was　grafted　with　diphenyl　methane　diisocyanate(MDI),　and　the　modified　CF　(MCF)　was　fabricated.　subsequently,　the　MCF/thermoplastic　polyurethane(TPU)　composite　foamed　materials　could　be　prepared　through　the　addition　of　MCF　into　TPU　matrix.　The　surface　characteristics　of　modified　CF,　the　structures　properties　and　section　morphology　of　foamed　composites　were　investigated　by　FT-IR,　XPS,　XRD,　Raman　and　FESEM.　The　results　show　that　chemical　grafting　can　gain　functional　groups,　high　roughness　and　disorder　of　carbon　fibers,　which　can　improve　the　compatibility　and　interface　bonding　strength　between　carbon　fibers　and　TPU.　Compared　to　3%　CF/TPU,　the　tensile　strength,　elongation　at　break,　tear　strength,　rebound　resilience　of　3%　MCF/TPU　are　increased　by　16.1%,　18.5%,　4.5%,　6.7%　respectively,　whereas　the　compression　set　is　reduced　by　6.9%.　©　2016,　Editorial　Board　of　Polymer　Materials　Science　&　Engineering.　All　right　reserved.