The degradation of rhodamine B in aqueous solution by using swirling jet-induced cavitation combined with H(2)O(2) was investigated. It was found that there is an obvious synergetic effect between hydrodynamic cavitation and H(2)O(2) for the degradation of rhodamine B. The effects of various operating parameters such as H(2)O(2) dosage, medium pH, solution temperature, fluid pressure and the dye initial concentration on the degradation of rhodamine B have been studied. It was found that the removal of rhodamine B in aqueous solution was increased with increasing the addition of H(2)O(2) and the fluid pressure, and the removal of rhodamine B was decreased with increasing the medium pH and dye initial concentration. It was also found that the degradation of rhodamine B is dependent on the solution temperature. The removal of rhodamine B increased with increase of temperature from 30 to 50 degrees C, but less degradation ratio is observed at 60 degrees C. The degradation kinetics of rhodamine B in aqueous solution using swirling jet-induced cavitation combined with H(2)O(2) under various operational conditions was also investigated. It was found that the degradation of rhodamine B follows a pseudo-first-order kinetics.