In order to solve the shortage of traditional evaluation method of flue-cured tobacco chemical quality,the evaluation of chemical quality with variable weight was discussed.Taking flue-cured tobacco of 6 main producing counties in Nanyang as the research object,the normal weight was determined by e^0/5—e^8/5 scale analytic hierarchy process,and the variable weight vector of local punishment state was selected to establish the chemical quality evaluation model of flue-cured tobacco based on the variable weight theory.The results showed that the chemical composition weights obtained by e^0/5 —e^8/5 scale analytic method were more precise than that by 1—9 scale.The rank of the chemical constituents of the six counties by the variable weight evaluation method was Xixia>Tanghe>Sheqi>Fangcheng>Dengzhou>Neixiang; which by normal weight evaluation method was Xixia>Sheqi>Tanghe>Fangcheng>Dengzhou>Neixiang.The evaluation results of variable weight in different counties were lower than that of normal weight,which was more tally with the actual situation.The results showed that the variable weight evaluation method could better meet the requirements of highlighting the negative effects of poor chemical components and the integral proportionality in chemical quality.