以云烟87为材料，结合烟叶“饥饿代谢”和烘烤工艺调整，设置3种烘烤工艺处理，分析不同烘烤工艺对上部烟叶化学品质的影响。结果表明，低温变黄可降低烟叶淀粉、蛋白质、总糖、还原糖含量，提升总氮、烟碱含量，提升烟叶香味物质。

To study the effects of different curing processes on the chemical quality of upper tobacco leaves. Using Yunyan 87 as the material， three curing processes were set up by combining the “starvation metabolism” of tobacco leaves and the adjustment of the curing process to analyze the effects of different curing processes on the chemical quality of upper tobacco leaves. Low temperature yellowing can reduce the content of starch， protein， total sugar and reducing sugar in tobacco leaves， and increase the content of total nitrogen and nicotine. The results provide theoretical basis to improve the quality of upper tobacco leaves， and optimize the curing plan.

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