Abstract: To explore the best key temperature and humidity which can influence the middle and upper tobacco leaf flue-curing in Longlin，according to the local tobacco baking properties，we adjusted and researched the key temperature and humidity levels at the yellowing and color-fixing stages，which can affect the appearance quality and economic characters of flue-cured tobacco. The results indicated that there was a significant differen ce in the quality of tobacco by using different curing technologies. The best conditions for the middle leaves were dry-bulb temperature of 38℃ and wet-bulb temperature of 36℃ at yellowing stage，and the dry-bulb temperature of 46℃ and wet-bulb temperature of 37℃ at color-fixing stage. For the upper leaves，the best conditions were the dry-bulb temperature of 40℃ and wet-bulb temperature of 36.5℃ at yellowing stage，and the dry-bulb temperature of 48℃ and wet-bulb temperature of 37.5℃ at color-fixing stage.