14 indexes of main chemical components from 37 samples were analyzed in flue-cured tobacco leaves from Henan tobacco-growing areas. The results indicated that: (i)The contents of total sugar, reducing sugar, total nitrogen, nicotine, potassium, chlorin, sulfur, organic potassium, total petroleum ether extract, total ash and the ratio of total nitrogen to nicotine in flue-cured tobacco leaves were medium, protein content and the ratio of total sugar to nicotine were high, and the ratio of potassium to chlorine was low. (ii) Coefficient of variation ( 50. 15 %) of the ratio of total sugar to nicotine was the biggest, coefficient of variation (12.31 %) of potassium was the smallest, (iii) The contents of total sugar, reducing sugar, total nitrogen, nicotine, protein, total ash and the ratio of total sugar to nicotine in flue-cured tobacco leaves had significant difference among different positions. (iv)The contents of potassium, chlorin, organic potassium, the ratio of total nitrogen to nicotine and the ratio of potassium to chlorine in flue-cured tobacco leaves had significant difference among different tobacco-growing areas. (v)The contents of total nitrogen, nicotine, total petroleum ether extract, protein, total ash, the ratio of total sugar to nicotine and the ratio of total nitrogen to nicotine in flue-cured tobacco leaves had significant difference among different colours.%对河南主产烟区37个烤烟样品的14项主要化学指标进行了分析.结果表明,①河南烤烟总糖、还原糖、总氮、烟碱、钾、氯、硫、有机钾、石油醚提取物总量、总灰分含量和氮碱比适宜,蛋白质含量和糖碱比略高,钾氯比稍低；②河南烤烟化学指标中糖碱比的变异系数(50.15％)最大,钾含量的变异系数(12.31％)最小；③烤烟总糖、还原糖、总氮、烟碱、蛋白质、总灰分、糖碱比在不同部位间差异显著；④烤烟钾、氯、有机钾含量、氮碱比和钾氯比在不同产区间差异显著；⑤烤烟总氮、烟碱、石油醚提取物总量、蛋白质、总灰分含量、糖碱比和氮碱比在不同颜色间差异显著.
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