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The environmental behaviour of insecticide 1-(2-chlorobenzoyl)-3-(4-chlorophenyl)urea(CCU) were studied．The results indicated that the insecticide concerning the risk assessment and safe for application of the chemical was not a long-persistent compound in the environment and degraded fastly in plant，soil，water and air．The maior degradation products of CCU were found to bc 4-chloroaniline，4-chlorophenyl urea， 2-chlorobenzamide， 2-chlorobenzoic acid， chloroisocyanatobenzene and 2-chloro-N-chlorophenyl benzamide．The study demonstrated that the insecticide would not be harmful to environment，especmuy to groundwater．However，attention should be paid to the potential problem caused by its degradation products．
