Abstract: Wollen-dyeing waster water was treated in a new type of open and revolling photocatalytic reactor.From some important factor which may affect the photocatalytic degradation of the organic dyes such as the initial concentration of the dyes,pH value,the volume of the feed solution,and the rotating rate of the reactor,solar radiation time which influence removal efficiency was studied.The results show that optimal pH value and optimal reaction time for degradation of the dyes are pH value 6 and 20 min respectively.The degradation efficiency is affected by thickness of water in the reactor rate.Over 98% degradation by suspended TiO 2 are observed under optimal conditions.