[目的]选用典型阴离子表面活性剂十二烷基苯磺酸钠,探讨其在不同条件下的降解行为。[结果]十二烷基苯磺酸钠的光降解速率随着光照强度的增加而增加;在蒸馏水中的效果较人工海水中的好;随着初始质量浓度的增加而降低。[结论]十二烷基苯磺酸钠的光降解速率与光照条件、介质、初始质量浓度都有关系,并且不同的表面活性剂光降解影响因素不同。 [Objective] To investigate the degradation behavior of typical anionic surfactant sodium dodecyl benzene sulfonate under different conditions. [Result] The photodegradation rate of sodium dodecylbenzene sulfonate increased with the increase of light intensity, the effect in distilled water was better than that in artificial seawater, and decreased with the initial mass concentration. [Conclusion] The photodegradation rate of sodium dodecylbenzenesulfonate was related to the light conditions, medium and initial mass concentration, and the influence factors of photodegradation of different surfactants were different.