Abstract: To improve the air-cured technology of burley tobacco, through the fan installed in the circulation ventilation of burley barn, the authors used temperature and humidity recorder to measure the temperature and relative humidity timely. The difference of temperature and humidity in burley barn during air curing were analyzed, the effect of wind fan on temperature and humidity in burly barn was compared. The results showed that, the temperature and humidity in burly barn was mainly affected by the outside weather, but the barn could relieve the effect of outside weather. The change trends of temperature and relative humidity in barn were opposite, when temperature in barn was higher, the humidity was lower. The temperature in barn upper layer was higher than that in lower layer; the humidity in barn upper layer was lower than that in lower layer. The wind fan in barn could regulate the temperature and humidity, reduce the difference of humidity and temperature between the upper and lower layer. But the temperature and humidity in barn were influenced by the outside weather, the effect of only installing circulating fan to reduce relative humidity was limited.