By　adjusting　the　oxidation　voltage,　electrolyte,　anodizing　time　and　other　parameters,　TiO2　nanotubes　with　high　aspect　ratio　can　be　prepared　by　oxidation　in　organic　system　because　anodic　oxidation　method　has　the　advantage　of　simple　preparation　process,　low　material　cost　and　controllable　morphology.　This　review　focusses　on　the　influence　of　anodizing　parameters　on　the　morphology　of　TiO2　nanotube　arrays　prepared　by　anodizing.　In　order　to　improve　the　photocatalytic　activity　of　TiO2　nanotubes　under　visible　light　and　to　prolong　the　life　of　photo-generated　carriers,　the　research　status　of　improving　the　photocatalytic　activity　of　TiO2　nanotubes　in　recent　years　is　reviewed.　This　review　focusses　on　the　preparation　and　modification　of　TiO2　nanotubes　by　anodic　oxidation,　which　is　helpful　to　understand　the　best　structure　of　TiO2　nanotubes　and　the　appropriate　modification　methods,　thus　guiding　the　application　of　TiO2　nanotubes　in　practical　photocatalysis.　Finally,　the　development　of　TiO2　nanotubes　is　prospected.　The　amorphous　TiO2　nanotubes　with　high　aspect　ratio　prepared　by　anodic　oxidation　are　transformed　into　stable　crystalline　phase　after　heat　treatment　or　water-assisted　treatment.　Then　the　band　gap　of　TiO2　nanotubes　is　changed　and　the　recombination　of　photo-generated　carriers　is　reduced　by　doping　and　surface　modification,　thus　improving　the　photocatalytic　activity　of　TiO2　nanotubes　under　visible　light.