Sweetpotato is a genus of sweetpotato (Ipomoea.L.) in the family Cyclophyllaceae, which originated in the tropical areas of northwestern South America and Mexico 11,000 to 12,000 years ago. it was introduced to Europe in the early 15th century, to Asia and Africa in the 16th century, and to our country in the latter part of the 16th century through the Philippines. At present, there are about 50 species and more than 1,000 varieties of sweet potatoes, which are widely planted in more than 100 countries in the world. It is cultivated in most parts of China, with the Yellow-Huaihuai Plain, the middle and lower reaches of the Yangtze River and the southeastern coast being the most concentrated areas of cultivation. Sweet potato is highly adaptable, easy to cultivate, highly productive and nutritious, not only as a food crop, but also as green and juicy fodder for its tuberous roots and stems and leaves. In addition, the potato can be used to make starch, alcohol, caramel, syrup and wine vinegar, etc., is one of the raw material crops of light industry. According to the United Nations Food and Agriculture Organization (FAO) statistics, the world *** there are 111 countries cultivate sweet potato, cultivation area is mainly distributed in Asia, Africa, developing countries. China is the main sweet potato producing area in Asia, and its sweet potato planting area and total output account for 69.4% and 84.6% of the world respectively. The perennial planting area in China is more than 6.7 million square hm, and by the mid-1990s, China had bred about 350 sweet potato varieties, and screened and characterized the high-starch varieties and parents of sweet potato.