The effects of methylβcyclodextrin(MCD) and hydropropylβcyclodextrin(HPCD) on solubilization and photodegradation of parathionmethyl were investigated. The results showed that the solubility of parathionmethyl increased linearly with the increase of the derivatives of βcyclodextrin. The solubilization of parathionmethyl increased 21.91 and 17.92 times, respectively ,in the presence of 20 g/L MCD and HPCD under 25℃.In addition, MCD and HPCD increased the photodegradation of parathionmethyl. The photodegr...