Carbon　nanotubes　(CNTs)　are　prepared　by　the　hot　filament　chemical　vapour　deposition　method　using　CH4　and　H-2　as　reaction　gases,　and　the　growth　behaviours　are　investigated　by　scanning　electron　microscopy　and　transmission　electron　microscopy.　The　results　indicate　that　the　CNTs　prepared　in　the　absence　of　N-2　or　glow　discharge　are　bent;　however,　they　are　in　an　aligned　state　after　introducing　N-2　into　the　chamber　or　forming　glow　discharge　under　a　negative　biased　voltage.　The　results　also　indicate　that　the　CNTs　are　of　a　bamboo-like　structure　when　N-2　is　intruded　as　a　reaction　gas　and　the　alignment　degree　of　the　CNTs　grown　under　glow　discharge　is　higher　than　that　grown　in　N-2.　This　illustrates　that　the　nitric　environment　and　glow　discharge　play　important　roles　in　the　growth　of　CNTs.　Combining　with　the　theory　related　to　alloy　thermodynamics　and　collisions,　we　have　analysed　the　growth　mechanism　of　the　CNTs　in　nitric　environment　and　glow　discharge.