The aromatic compound, which has stable properties, cancer-causing function, big toxicity and difficult degradation existes in natural environment extensively.It is contaminant that our country controls prioritily. This experiment was studied on xylene and benzene which is degraded difficultly in the aromatic compound.it is possible that the water quality fits the national effluent standard by ultrasonic radiation. As a kind of catalyst means ,the ultrasonic radiation has developed quickly on the degradatio...