my country is the world's largest cotton-producing country, with a total annual output of 6-7 million tons of cotton (lint), 6.73 million tons in 2006/07, an annual output of 9.6-11 million tons of cottonseed, and 11 million tons in 2006/07. . Cotton seed contains 50-55% cotton kernel, cotton kernel contains 30-35% oil, and cotton kernel contains 35-45% protein. Cottonseed is not only a good oil resource, but also a major protein resource that needs to be developed and utilized urgently.