The　porous　carbon　nanotubes　(CNTS)/activated　carbon　composite　beads　were　modified　by　L-tryptophan　using　epichlorohydrin　coupling　method.　The　composite　beads　were　characterized　by　SEM,　N2　adsorption,　FTIR,　TGA　and　XPS　etc.　Then　these　composite　beads　were　applied　to　adsorb　low　density　lipoprotein　(LDL)　by　static　adsorption　experiment　in　vitro.　The　results　show　that　the　composite　beads　could　be　modified　by　L-tryptophan　using　epichlorohydrin　coupling　method.　With　the　increase　CNTs　mass　ratio,　the　adsorption　capacity　of　LDL　increase.　When　CNTs　ratio　is　45wt%,　the　adsorption　amount　of　LDL　reaches　4.623　mg　·　g-1,　is　2.3　times　as　great　as　that　of　beads　without　CNTs.　These　should　be　ascribed　to　the　highly　developed　20∼100　nm　porous　structures　and　the　increase　of　L-tryptophan　amount　on　the　composite　beads　mainly　brought　about　by　CNTs,　enhancing　the　LDL　adsorption　ability　onto　the　composite　beads　greatly.　So　the　composite　beads　have　good　prospects　as　LDL　adsorbent　in　hemoperfusion.