Deeolourization and COD removal fm synthetic wastewater containing Reactive Btilliant Orige K-R (RBOKR) dye using sonophotoeatalydc technology was investigated. Experimental results showed that this hybrid technology could eflleiently remove the eolour and aduce COD from the synthetic dye-cont aining wastewater, and that both processes fonowed pseudo first-order kinetics. At the condition of 0.1 m3 h-I airflow, 0.7S gdm-3 titanium dioxide and 0.5 mmol dm 3 RBOKR solution, the rate constants of decolourlzation and COD removal we 0.0750 d 0.0143 min-1 respectively for the sonophotoeatalytic process; 0.0197 d 0.0046 min respectively for the phot at Mytic process and 0.000S and 0.0001 min J respectively for the sonochieal process. The rate constants of sonophotocatalysis were greater than that of both the photocatalytic and sonochemical processes either in isohtion or as a sum of the individual prcess, indicating an appannt synergetic effect heeen the photo-and sono-processes.