1. Tobacco leaves are mainly prepared by semi-dry method and semi-dry method. In the early stage of air-drying, the air-drying room is required to maintain a high temperature to release the water in the leaves. It will wither and turn yellow after 3-4 days. Ventilation should be strengthened in the air drying room to keep the relative humidity at 80%, which can keep the color unchanged and is beneficial to tobacco drying.

2. After the tobacco leaves are prepared, start the tobacco leaf fermentation.

3. Aging of tobacco leaves: after the moisture content of tobacco leaves is qualified, they are bundled and aged for more than half a year. When it is found that there is obvious fever during aging, it is necessary to turn over the pile in time.