Abstract: The changes of major chemical composition, aroma components and smoking quality of flue-cured tobacco strips cased before redrying and storing duration after redrying were studied.The results indicated that:1) the total sugar, total alkaloid, tar, smoke nicotine and CO of cased and uncased redried strips decreased gradually with the prolongation of redrying and storing durations;2) the reduction of total sugar, total alkaloid, tar and smoke nicotine of most cased strips was obviously greater than that of uncased strips in three to six months after redrying, their difference decreased gradually with the continuation of storing;3) the CO reduction of cased and uncased strips was basically similar;4) the total aroma component both in cased and uncased redried strips increased with the prolongation of storing duration, while the increase of the components in cased strips was greater than that in uncased ones, especially in three to six months after redrying;and 5) the change of smoking quality of cased and uncased redried strips with the storing duration after redrying was parallel with the change of total aroma components.