By means of the theory of dissipative structure and on the basis of analyzing the previous theories of strategic management, key environmental factors and internal factors are decided, and then a dynamic model of sustainable competitive advantage is formed. From the viewpoint of dissipative structure, the model analyzes the interaction between the environment and internal factors of an enterprise and how an enterprise adjusts the interaction to form and keep its competitive advantage. Therefore, the model provides a new referenced scheme to analyze sustainable competitive advantage for enterprises.