Abstract: Photocatalytic oxidation of phenol in water was studied in a shallow pond reactor using TiO2 immobilized onto activated carbon fiber as photocatalyst. A 300 W high pressure Hg-lamp(365 nm) was used as light source. The influences of light intensity, light filter as well as different light sources on the photocatalytic process were investigated, and the comparison of photolysis, adsorption and photocatalysis was also conducted. The results showed that there was almost no oxidation of phenol in photolysis process, the ratio of the photocatalytic degradation rate constant and adsorption rate constant of phenol over TiO2 /ACF was 3.35/1; increasing Hg-lamp light intensity can improve the rate of oxidation; there was an apparent improvement of the photocatalytic rate under the irradiation of the high pressure Hg-lamp without filter, while the photocatalytic rate could be still described in terms of pseudo first order kinetics; the oxidation rate of high pressure Hg-lamp with a filter was lower than that of a UV germicidal lamp.