Titania　nanocrystals　were　prepared　by　a　low　temperature　process　in　liquid　media.　The　crystallization　of　amorphous　precursor　could　proceed　at　low　temperature　around　room　temperature.　The　thermodynamically　stable　rutile　formed　at　low　temperature　below　70°C,　while　the　metastable　anatase　formed　at　higher　temperature.　The　phase　composition,　microstructure,　morphology,　and　specific　surface　area　of　titania　changed　significantly　depending　on　the　reprecipitation　temperatures.　Well-crystallized　needle-like　rutile　titania　crystals　with　high　specific　surface　areas　possessed　higher　photocatalytic　activities　than　those　of　anatase　crystals　under　visible　light　irradiation　of　wavelength　＞400　nm　and　/or　＞510　nm.