This　work　provides　a　simple　but　efficient　strategy　for　the　adjustment　of　texture　and　regular　morphology　of　graphitic　carbon　nitride　(CN)　material　by　the　post-synthesis　of　successive　heat-vacuum　treatment　(SHVT)　method　without　using　hard　templates.　The　modified　CN　displayed　various　hollow　microtubule　structure　and　the　improvement　of　s-heptazine　unit　depending　on　the　SHVT　temperature.　The　best　hollow　microtubule　morphology　with　highest　contents　of　the　key　s-heptazine　structure　can　be　achieved　by　SHVT　at　540　degrees　C.　These　modified　CN　samples　led　to　the　highest　photocatalytic　H-2　yield　of　1160　mu　L　for　4　h　reaction　under　visible　light　irradiation,　which　is　almost　10　times　higher　than　that　of　the　traditional　CN　(118　mu　L).　The　results　represent　an　alternative　approach　to　preparing　hollow　microtubule　morphology　and　improving　the　s-heptazine　structure　in　CN　for　enhancing　photocatalytic　performance.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.