Abstract: In order to definitude the countermeasure for effective control of chlorpyrifos residues in cabbage，the degradation and residual dymanic changes of chlorpyrifos in cabbage under different cultivation methods were studied. The result showed that the half-life of chlorpyrifos in cabbage was 1.650～1.824 d，the residue in cabbage was related to the cultivation methods of cabbage. The cabbage was sprayed once with chlorpyrifos 40% EC using the dose of 25 mL/667 m²， and the final residue in the cabbage under open cultivation was less than 0.1 mg·kg^-1 after 7 days. The safety interval of chlorpyrifos in cabbage under protected cultivation before harvest should be extended to an appropriate level.

Key words: chlorpyrifos, cabbage, pesticide residue, dynamic