The photocatalytic degradation of trichloroethylene in water on various type of TiO₂ was studied. Physical properties of TiO₂ were characterized gy XRD, SEM, and BET. P25- TiO₂ from Degussa has mixed structure of anatasd and rutile, TiO₂ from Aldrich has pure anatase, and TiO₂ from KIER has pure rutile structure, respectively. Optimum conditions for TCE degradation were examined. Results showed that optimum loading amount of catalyst was 0.1 wt% and flowrate of recirculation was 200 sccm. TCE degradation decreased as initial concentration of TCE was increased. P25- TiO₂ from Degussa has mixed structure of anatase and rutile showed better activity than those of pure antase and rutile structure.