Abstract: Ultrasound cavitation effects have been studied by changing ultrasound power and ultrasound action time and solution temperature.And the iodine released from potassium iodide is used to determine the cavitation yield of 25kHz /40kHz dualfrequency ultrasound,40kHz ultrasound and 25kHz ultrasound.The results show:in the case of same ultrasound power input,the iodine content,i.e.the cavitation yield,of 25kHz/40kHz dualfrequency ultrasound is more than that of 40kHz ultrasound or 25kHz ultrasound.