Altitude adaptability of tobacco varieties of NC102 and NC297 were determined in two main tobacco growing townships in Anning and Songming county, Kunming. Data were collected in experiments conducted at 10 sites at every 100 m in the altitude range of 1700-2200 m, where cultivation practices were largely consistent. The effects of altitude on physical properties and chemical components of flue-cured tobacco were determined. The result indicated that: (1) The chemical components of leaves were more sensitive to altitude than the physical properties. (2) In the 1700-2200 m altitude range, altitude was significantly negatively correlated with leaf weight, opening degree, content of total nitrogen, potassium, chlorogenic acid and rutin. Also in the 1700-2200 m altitude range, altitude was significantly positively correlated with stem ratio, total sugar and reducing sugar content. In summary, Leaf chemical components, polyphenol content and aroma properties of NC102 and NC297 were optimum at altitude range of 1700-1900 m in Kunming, and the tobacco leaf quality decreased as follows:NC102>NC297.%为探讨昆明烟区美引烤烟新品种 NC102、NC297的海拔适应性，在栽培措施一致的前提下，分别在安宁县和嵩明县的2个植烟乡镇，以每100 m为海拔梯度，从海拔1700~2200 m共布置10个试验点，研究了种植海拔对两品种烤烟物理性状和化学成分含量的影响。结果表明：①烟叶化学成分和物理性状对种植海拔的敏感性表现为化学成分>物理性状；②在1700~2200 m的研究范围内，烟叶单叶重、开片度、总氮、钾、绿原酸和芸香苷与海拔高度呈显著或极显著负相关，含梗率、总糖和还原糖与海拔呈显著或极显著正相关。综合烟叶常规化学成分、多酚和香气物质含量认为，昆明烟区美引烤烟新品种NC102和NC297均更适宜种植在1700~1900 m的海拔区间，且烟叶品质表现为NC102>NC297。
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