In order to increase economic efficiency, crudely processed Chai yam, which has a diameter of 1 cm or more, can also be selected for finishing. The technical points for finishing are:

1. Washing: Wash the yam, which needs to be finished, into the water tank to wash away dirt and dust until it is white. Remove and spread to foil and let it dry until the surface feels smooth when touched.

2. Fumigation: Put dried yam yam into the basket and put it in the smokehouse for the second fumigation. Generally it takes one or two hours to smoke.

3. Boring goods: After the smoked wood yam pour into a deep dry pool, covered with sacks, stuffy for a couple of hours.

4. Pick up the goods: The stuffed Chaishan medicinal board is made into a cylindrical shape. The thicker the rounder, the better.

5. Pulling out: Put the good yam yam into the foil to dry, usually dry in the morning, grading in the afternoon, and pack separately.

6. Turn the box: Place the packed box into the room, empty it once every two days, and stick to it for three or four days. When the yam is to be dried to 70% or 80%, it will be shipped to the outside and dried until it is dried.

After the above processing, you can further deep processing, the method is:

1. Scrape: Soak the sun-dried Chai yam with water, soak the outer layer and then scrape off the skin with a knife and remove the dust.

2. Grinding: One by one, fine wood sandpaper is used for honing, so that no dry wrinkle, no yellow spots, and no pits are provided to the firewood yam to ensure that the color is white, the surface is flat, and the shape is round.

3. Grinding head: Both ends of the Chai yam should be smoothed and grinded with sandpaper. Horseshoe-shaped and potholes must not be formed.

4. Hanging powder: Use green bean paste to pick up yam.

5. Drying: Chai yam, which is hung with slurry, is then air-dried. After drying, it is put into a moisture-proof box, which can then be exported for export.

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