Yam, also known as potato, long potato, yam egg, etc., is a medicinal and edible economic crop. However, yam has a large amount of water, so it is inconvenient for long-term storage and transportation. After deep processing, economic benefits can be further improved. First, yam dry in early November to early April next year, can be digging yam. During the excavation, the integrity of the yam tubers should be maintained and cleaned once. Immediately after the tubers were shipped back, they were washed, soaked in water, and the skin was scraped off with a piece of bamboo or glass to dry the water. Put the yam flat on a smooth table and dry it. Second, yam dry film selection round shape, smooth surface, no tumor, no pests, no frostbite of yam tubers, soaked in water for 10-15 minutes. After removing impurities such as dirt, rinse with water 2-3 times, gently scrape the yam skin and cut into thin slices of 3 = 4 mm in thickness. The pellets were spread on a drying sieve and dried by a drying machine at a temperature of 45°C for 7-8 hours. In the early days of drying, the air inlet is fully opened, and hot and humid exhaust gases are fully eliminated. In the middle of the drying process, after the yam surface is dry, one third of the air inlet is shut off, and the return door is opened, so that the waste heat air with low humidity is heated by the heater and sent to the drying room for reuse to save energy. While hot, pour the dried sorghum on the bench and remove the impurities and yellowed yam. At the time of selection, Yamada tablets are susceptible to moisture absorption due to exposure to air for a long time. They should be put in a dryer and dried again and then packed in plastic bags. Third, the yam powder will be washed to the skin of the yam or processed yam dry film when the remaining non-standard fragments, into the refiner refining. In order to fully extract the starch material in yam, two refinings can be used to grind the slurry as much as possible. The ground slurry was sieved twice with 80 mesh coarse sieves and 100 mesh fine sieves, respectively. The sieved material was fed to a centrifuge and spun for 5 minutes. The precipitate is then sent to the drying process and dried at a temperature of 40-50°C until the moisture content reaches about 10%. After drying, they are crushed, sieved, and sieved through 100 mesh or 120 mesh. They are finished products and are packed in containers such as plastic bags or glass bottles. China Agricultural Network Editor