Abstract: Abstract: Cotton Stalk is one of the most important crop stalks. Considering the biological, physical and chemical properties of cotton stalks, and comprehensively analysising the domestic and overseas using status of cotton stalks, the article summarizes the theoretical models for circular utilization of cotton stalks, which concentrated in three aspects, the industrial, agricultural and animal husbandry ,and the use of energy. One of emphases should be put on using cotton stalk as energy.