Abstract: Sodium dodecylbenzenesulfonate(SDBS) as a kind of representative surfactant has widely been used and become one main source of environmental pollution.Anatase TiO₂ was adopted as catalyst and low-power ultrasound used to degrade SDBS in the water.In the experiment,all kinds of factors on degradation ratios such as initial mass concentration of SDBS,adding amount of TiO₂,initial pH of solution,temperature,frequency and power of ultrasound and reused times of catalyst were reviewed.When the experimental conditions of initial SDBS 50.00(mg/L,) TiO₂ addition(1 000)(mg/L,) pH 3.00,(40 ℃,) ultrasound frequency 40 kHz and ultrasound output power 50 W were adopted,SDBS could almost be completely degraded within 300 min,according to derivative spectrophotometry.Moreover,the kinetic research shows that the sonocatalytic degradation of SDBS is a first-order reaction.