Abstract: In order to rational use of Chlorimuron-ethyl and avoid the impact on the following crops,water culture was conducted to investigate the effects of different concentrations Chlorimuron-ethyl(50.000 0,25.000 0,12.500 0,6.250 0,3.125 0 g/L)on cabbage root length,bud length,Chlorophyll content,malondialdehyde content and soluble sugar content.The results showed that the tolerance of Chinese cabbage to chorimuron-ethyl was different.The bud was more tolerant to Chorimuron than root.When the inhibition rate of chlorimuron-ethyl on bud length and root length was 10%,the concentrations of Chlorimuron-ethyl(LC10)was 4.675 4μg/mL and 1.563 3μg/mL,respectively.The Chorimuron-ethyl had differet impact on the contents of Chlorophyll,soluble sugar and MDA in Chinese cabbage.With concentration increasing,the chlorophyll content showed a decreasing tendency at the same time,the contents of MDA and soluble sugar showed an increasing tendency.Thus,when Chorimuron-ethyl is used to control weeds in the field,the best method and proper dose must be chosen.