1. changed the system and structure of economics. The concept, content, model and analytical tools of non-cooperative game theory have penetrated into most disciplines of economics, such as microeconomics, macroeconomics, labor economics, international economics, environmental economics, etc., and changed the content and structure of these disciplines, becoming the basic research paradigm and theoretical analysis tools of these disciplines, thus changing the connotation of each branch of the original economic theoretical system. 2. Expand the scope of economics to study economic problems. Primitive economics lacks effective methods to model uncertain factors, changing environmental factors and the interaction between economic individuals, so it is impossible to dissect and analyze economic problems at the micro level. Nash equilibrium and related model analysis methods, including extended game method, backward induction method, sub-game perfect Nash equilibrium and other conceptual methods, provide economists with in-depth analysis tools. 3. Strengthened the depth of economic research. Nash equilibrium theory does not avoid the direct interaction between economic individuals, nor is it satisfied with the simplification of complex economic relations between economic individuals. When analyzing problems, we should not only stay at the macro level, but also deeply analyze the deep-seated reasons and laws behind the appearance, emphasizing the discovery of the root causes of problems from the perspective of micro-individual behavior laws, so as to understand and explain economic problems more deeply and accurately. 4. A research paradigm system based on classical game is formed. That is to say, we can classify various problems or economic relations according to the types or characteristics of classical games, and study them according to the corresponding analysis methods and models of classical games, so as to transplant the experience gained in one field to another conveniently. The relationship between economics and other social and natural sciences has been expanded and strengthened. Nash equilibrium is great because it is ordinary, and it is almost everywhere. Nash equilibrium theory is not only applicable to the law of human behavior, but also to the law of survival, movement and development of other creatures other than human beings. The bridge function of Nash equilibrium and game theory makes economics more closely linked with other social sciences and natural sciences, forming a virtuous circle of mutual promotion between economics and other disciplines. 6. Changed the language and expression of economics. Kandori (1997), who is quite accomplished in evolutionary game theory, once made a humorous extension of paul samuelson's famous saying, "You can even turn a parrot into a trained economist because it only needs to learn two words, that is,' supply' and' demand'." He said, "Now this parrot needs it.