Because of widespread use of the pyrethroids pesticides, the environmental problems and safety issues of agricultural production and daily life have being become increasingly prominent. This paper reviewed the photodegradation behavior of the pyrethroids pesticides, such as natural light degradation, UV irradiation degradation, photocatalytic degradation, microbial degradation under illumination and radiation degradation. And the factors affecting of the photodegradation, such as light intensity, pH, oxygen, solvent, metal ions, humus, interactions with other pesticides, etc. were discussed in the paper. In the end, the paper analyzed the mechanism of pyrethroids light degradation.