Abstract: In order to improve the smoking quality of tobacco leaf,the effects of concretes of more than 20 kinds of Chinese herb,such as Flos Sophorae immaturus,day-lily,etc.,and 3 enzyme agents,including cellulase,papain,and neutral proteinase,on the chemical compositions and smoking quality of flue-cured tobacco leaf,B3F,were studied.The results showed that:1) the flavor quality,flavor concentration and taste of B3F were obviously improved by the addition of Flos Sophorae immaturus concrete,day-lily concrete or neutral proteinase;and 2) the contents of total sugar,total nitrogen,and nicotine in B3F treated with the mixture of 0.03% Flos Sophorae immaturus concrete,0.01% day-lily concrete,0.1% cellulase and 0.2% neutral proteinase and stored at room temperature for one month were close to their contents in untreated B3F aged for one year,three months and nine months,respectively.