Hollow　metal　oxide　fibers　(TiO2　and　Fe2O3)　have　been　prepared　by　using　activated　carbon　fibers　(ACFs)　as　the　templates,　through　a　simple　impregnation　and　heat　treatment.　The　resulting　products,　as　compared　to　ACFs,　possessed　not　only　a　similar　morphological　feature　upward　to　the　micrometer　scale　but　also　different　surface　nanostructures　with　unique　morphology.　The　TiO2　fibers　displayed　overlapped　＂wormlike＂　surface　and　a　hierarchical　structure　with　two　distinguishable　layers,　the　inner　layer　and　the　outer　layer,　which　were　composed　of　the　particles　of　7　and　15　nm,　respectively.　It　was　also　found　that　the　reaction　temperature　had　a　significant　effect　on　the　TiO2　surface　morphology.　The　Fe2O3　fibers　exhibited　a　rough　and　crinkle-like　surface　and　were　also　composed　of　hierarchical　particles.　Both　TiO2　and　Fe2O3　fibers　possessed　the　hierarchical　pore　structure　with　mesopores　in　the　walls　of　the　large　hollow　channel.　Such　porous　architecture　favored　the　resultant　TiO2　with　better　apparent　photoactivity　than　P25　titania　for　degradation　of　gaseous　acetone　and　would　also　make　the　materials　useful　for　further　application　in　other　fields.