Abstract: In order to improve the quality and industrial usability of upper leaves and to study the impact of different leaf structure, leaf blade structure of the top six leaves of tobacco plants in Xuchang was divided into groups of loose, slightly loose, slightly dense, dense, very dense.. The relationships between leaf structure of different grades and appearance quality, physical characteristics, chemical composition and sensory quality were studied. The results showed that, when the leaf structure changed from tight toward loose, the appearance quality became better, and the loose leaf was the best, followed by the slightly loose leaf. And the physical property tended to be suitable, and the blade density of loose and slightly loose leaves reduced significantly. The chemical composition tended to be suitable, and the protein content of loose and slightly loose leaves reduced significantly, and the total and reducing sugar content increased. The loose leaf's starch content reduced significantly and sugar/alkali ratio rose gradually. The sensory quality was among the lower middle to good level, and the loose leaf was the best, followed by the slightly loose leaf. The industrial usability rose gradually, and the ratio of loose and slight loose leaf in class I cigarette formula was 100% and 85.71% respectively. The tobacco quality with slight dense structure was medium, which was usually used in class Ⅱ and Ⅲ cigarette formula. The tobacco quality with dense and very dense structure was poor, which were only used in class Ⅳ and Ⅴ cigarette formula. The tobacco samples with different leaf structure can be used in training, professional grade guidance, tobacco purchasing, receiving, and the leaf structure is available characteristic index of appearance quality in selecting usable tobacco in redrying and processing.