The pot experiment was carried out to study the different maturity upper leaves' changing characteristics in physical characteristics, appearance quality, chemical constituents, sensory quality etc. Through different harvesting methods. The results showed that; compared with other harvest methods, when the upper leaves were harvested in one time when the top one leaf was mature or each upper leaf was harvested when it was ripe, the quality of the upper leaves was higher, and more similar to that of middle leaves. The effect of harvesting methods on physical characteristics were bigger than that of maturity. The method of harvesting in one time could significantly reduce the leaf weight and density, and softer the organizational structure. The effect of maturity on chemical constituents was bigger than that of harvesting methods. The total sugar, totalnitrogen, nicotine, reducing sugar offensive odor and irritancy dropped with the increase of maturity, but the potassium content, aroma quality and volume and usability were on the contrary. Harvesting upper leaves in one time could improve the whole maturity of upper leaves, but the tobacco yield and value were slightly declined.%通过不同采收方式研究不同成熟度上部烟叶物理特性、外观质量、化学成分、评吸质量等变化特点.结果表明:不同采收方式相比,顶1叶尚熟时集中采收上部6叶或上部各叶适熟时进行分次采收做法,所得上部叶整体质量较高,且更接近中部烟叶.采收方式对烟叶物理特性影响远大于成熟度对烟叶影响,集中采收能明显降低上部烟叶单叶重和叶密度,叶片组织结构相对疏松；成熟度对烟叶化学成分的影响大于采收方式对烟叶的影响,成熟度提高后总糖、总氮、烟碱和还原糖含量下降,钾含量有所提高,烟叶的香气质、香气量提高,杂气和刺激性降低,可用性有所提高.集中采收可提高上部烟叶整体成熟度,但烟叶产量和产值因此稍有下降.
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