Abstract: An experiment was carried out on redried leaves in north Shaanxi Province after adding enzymes to improve inherent quality and usability of tobacco leaves. The results showed that color intensity and luster of the treated tobacco leaves increased.. Analysis through GC/MS indicated that adding enzyme could accelerate physiological and biochemical reaction, and enhance the total amount of key volatile aroma constituents, with degradation and conversion of starch, reducing sugar, protein, amino acid, high fatty acid and precursors of aroma constituents. The treated leaves were definitely enhanced in sensory character, with increased volume of full aroma, softer smoke, reduced offensive odor, and improved after taste.