A new rotating falling film slurry photoreactor（RFFS）was proposed based on the analysis of the characteristics of traditional bubble slurry photoreactor（TBS）.The performance of RFFS was investigated by using Degussa P25 as the photocatalyst and phenol as the model chemical of photocatalytic degradation.In comparison，RFFS had higher efficiency in photocatalytic degradation，especially it could be operated at a higher concentration of catalyst，thus solving the problem of light transfer in the traditional bubble slurry photoreactor.The mass transfer in the photocatalytic slurry was largely strengthened because of the presence of the rotating film on the reactor wall，and the bulk slurry in the center part of the reactor was circulated and flowed down spirally on the reactor wall，and had more time to accept photons.As a result，the efficiency in photocatalytic degradation was largely improved.When circulating flow rate was more than 2.7 L·min-1，aeration rate was 1.0 L·min-1 and catalyst concentration was 3.0 g·L-1，the efficiency in photocatalytic degradation for RFFS increased by 1.6 times for the traditional bubble slurry photoreactor.The degradation kinetics of phenol in RFFS followed apparent first order reaction kinetic model.