Carbon　nanotips　were　prepared　by　plasma-enhanced　hot　filament　chemical　vapor　deposition　under　different　bias　current　using　CH4,　NH3　and　H-2　as　the　reaction　gases,　and　investigated　by　scanning　electron　microscopy　and　micro-Raman　spectrometer.　The　results　indicate　that　the　carbon　nanotips　have　graphite　structure.　With　increasing　of　the　bias　current,　the　tip　angles　of　the　carbon　nanotips　are　reduced　and　their　growth　rate　are　increased.　Combined　with　theory　related　to　plasma　and　sputtering,　the　formation　of　the　carbon　nanotips　and　the　change　of　their　growth　rate　with　the　bias　current　are　discussed.