What economics cultivates is actually a kind of thinking and an attitude. It enables people to examine various economic phenomena from a higher level, analyze the economic communication activities between people and collectives in essence, and fundamentally understand the production and operation mode of enterprise profits. There are many methods to study economics, some of which come from other disciplines. Mathematics is helpful to the expression and reasoning of economic principles, without complex algebra, and in many cases, a few diagrams are enough; History provides a lot of experience for the development and verification of economic principles; Econometrics (statistics of economic data) is also indispensable to test economic principles. Experimental economics, including laboratory experiments and computer experiments, is also one of the methods of theoretical development and verification. Finally, we only need to think about and interpret economic phenomena, which is also a way to learn economics.