94 samples of flue-cured tobacco leaves from Sanmenxia were used as materials to analyze the variation of neutral aroma components of flue-cured tobacco among different locations,different varieties,different grades,different soil types and different nitrogen levels.The results indicated that the average content was as fallows: maillard reaction products 22.58±4.72μg/g,products degraded by cembrane 52.88±32.96μg/g,carotenoid substances 47.96±6.02μg/g and neophytadiene 743.92±200.96μg/g,with positive coeffic...