Onion, also known as ball onion, round onion, jade onion, shallot, Dutch onion, belongs to the genus Liliaceae , is a 2-year-old herb. There are many opinions about the origin of onions , but most of them believe that onions are produced in the plateau areas of Central Asia in Southwest Asia, Iran, and Afghanistan. The origin of the onion has a history of more than 5,000 years. It spread to Egypt in 1000 BC, then to the Mediterranean region, to the United States in the 16th century, to Japan in the 17th century, and to my country in the early 20th century. Onions are widely distributed in our country, cultivated in all parts of the north and south, and the planting area is still expanding. It is currently one of the main vegetables in my country. my country has become one of the four countries (China, India, the United States, and Japan) that produce large onions. The planting areas in my country are mainly Shandong, Gansu, Inner Mongolia, Xinjiang and other places.