An experiment was conducted to investigate the tobacco leaf curing effect by hot air circulation barn. The results showed that, compared to ordinary curing barn, the hot air circulation barn had smaller temperature variation between top and bottom shelf of the barn at stage of yellowing, color fixing, and drying. The maximum and minimum temperature difference in curing barn was 2℃ and 0.5℃, respectively. The hot air circulation barn produced leaves with more harmonious chemical components. The output value of the cured leaves increased 750 RMB yuan/ha. The coal for curing was reduced by 1.02 kg per kg leaf. The curing time was reduced 7 hours. Overall economic benefit was improved remarkably.