Abstract: Effects of 4 kinds of hot-air circulation fans with power (60W, 90W, 120W and 150W) on the horizontal and vertical temperature, the wind speed in the barn, and the cured leaf quality were compared. The testing barn was 2.7ｍ×3.3ｍ with the space separated into five floors and a clearance of 25cm between two rods with leaf plait. The results showed that hot-air circulation with the fan of 90~120W has significantly effects on increasing characteristics of hot-air circulation in the barn and improving the cured leaf quality of tobacco.