Relationship between chemical compositions / index and smoking quality were analyzed by applying generalized additive models using 375 samples including B2F, C3F and X2F grades of flue -cured tobacco in Hunan province Results showed that: (1) the majority others presented "(U) " or " U " shaped relationships except that a few chemical components / index showed strongly linear correlation with smoking quality,; (2 ) the appropriate value of the key factors which represented qualities of flue - cured tobacco in Hunan province, such as sugar to nicotine ratio, nicotine, total nitrogen, total sugar, reducing sugar, nitrogen to nicotine ratio, and organic potassium, were about 9% , 3% , 2. 2% , 25% , 22% , 0.8% , 1.2% , respectively; (3 ) among the nine indexes of smoking quality, chemical compositions / index made the significant impact on concentration of aroma and irritancy, while less impact on smoke aftertaste; and (4) compared three potassium indexes, the representational abilities to smoking quality is in the following order; organic potassium > potassium to sulfur ratio > potassium to chlorine ratio.%以湖南烤烟B2F、C3F和X2F等级375个样本为研究对象,运用广义可加模型较为系统地研究了烤烟主要化学成分/指标与评吸质量间的线性与非线性关系.结果表明:除部分主要化学成分/指标与烤烟评吸质量呈现较强的线性关系外,在一定含量范围内,多数主要化学成分/指标与评吸质量呈现“∩”或“∪”形抛物线关系；表征湖南烤烟评吸质量的关键化学成分/指标有糖碱比、烟碱、总氮、总糖、还原糖、氮碱比和有机钾,其适宜值分别为9、3％、2.2％、25％、22％、0.8和1.2％左右；烤烟主要化学成分/指标对香气量和刺激性的影响最大,对余味的影响最小；在钾氯比、有机钾和钾硫比这3项化学指标中,有机钾对烤烟评吸质量的总体表征效果最好,其次是钾硫比,钾氯比的总体表征效果最差.与有机钾一样,钾硫比也是1个较好的综合评价指标.
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