The drying procedure is divided into 4 stages. The temperature of the first stage is 50°C and the drying time is 2 hours, so that the sweet-scented osmanthus in the drying room could be evenly heated. Generally, the drainage can be seen in about 50 minutes. After the temperature is balanced, the second stage is entered. The temperature raise to 55%. The relative humidity in the drying room should be set at 30%, and it shall continuous dehumidify for 6 hours. At this time, the water volume of the drain pipe increases. In the third stage, the temperature is raised to 58°C, the relative humidity in the drying room is set at 20%, the drying time is 2 hours, and it shall continuously dehumidify. After running for 1 hour, the water flow of the drain pipe ends and becomes a water droplet. After working continuously for another 1 hour, the drying work can basically be completed.