In order to find out the relationship of appearance characters with its main chemical components and smoking quality of flue-cured tobacco, 127 middle leaves of flue-cured tobacco were sampled from Xuanwei County in Yunnan Province, their appearance characters and smoking quality were evaluated and their main chemical components were determined.The results showed that the correlations between tobacco leaf color, oil and its main chemical compositions were higher, and the correlations between leaf maturity and its main chemical compositions the next.Darker leaf related to higher nicotine content and lower starch content.The total sugar contents dropped but starch contents raised with the increase of leaf oil.Leaf oil presented higher correlations with its smoking quality than did leaf maturity, color, and body.The direct contribution of leaf color to smoke thickness was the biggest; that of oil to flavor type score, smoke glomeration, dryness and sweetness,aroma quality and quantity, aftertaste, offensive odor, total panel test score was the biggest; that of leaf maturity to smoke irritation and softness was the biggest.For Xuanwei tobacco, "oily" to "oily + " leaf with moderate-" to "moderate" body has the best intrinsic quality, and the former is the key factor influencing smoking quality.%为了探索烟叶外观品质因素与其主要化学成分和感官评吸质量的关系,采集了云南宣威中部烟叶样品127份,进行了烟叶外观质量和感官评吸鉴定,并测定了其主要化学成分.结果表明云南宣威烟叶颜色、油分与其主要化学成分相关性较强,而成熟度、身份与其主要化学成分的相关性次之.随烟叶颜色加深,烟碱含量增加,烟叶淀粉含量降低;随烟叶油分增加,总糖含量降低,淀粉含量提高.烟叶成熟度、颜色、身份与其感官评吸质量相关性较弱,烟叶油分与其感官评吸质量相关性较强.烟叶颜色对烟气浓度的直接贡献最大;烟叶油分对烟叶香型得分、烟气成团性、烟气干燥感、甜度、香气质、香气量、余味、杂气和评吸总分的直接贡献最大;烟叶成熟度对烟气柔和性和刺激性的直接贡献最大.在云南宣威,身份"适中一"至"适中"、油分"有"至"有+"的烟叶内在质量最好,油分多少是影响烟叶感官评吸质量的首要因素.
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