1. Economics is a science that studies various economic activities, corresponding economic relations and their operation and development laws of human society at various stages of development. Among them, economic activities are closely related to people's production, exchange, distribution and consumption under the premise of certain economic relations. In economic activities, there is a problem of getting more benefits with less consumption. Economic relationship is the mutual relationship formed by people in economic activities. Among all kinds of economic relations, the production relationship is the dominant one. 2. Management is a comprehensive interdisciplinary subject, and it is a science that systematically studies the basic laws and general methods of management activities. Management is produced to meet the needs of modern socialized mass production. Its purpose is to study how to improve the productivity level under the existing conditions through the reasonable organization and allocation of human, financial and material resources. 3. Psychology is a science that studies human psychological phenomena, psychological functions and behaviors. It is not only a theoretical discipline, but also an applied discipline. Including basic psychology and applied psychology. Psychological research involves many fields such as perception, cognition, emotion, personality, behavior, interpersonal relationship and social relationship, as well as many fields of daily life-family, education, health and society. On the one hand, psychology tries to explain the basic behavior and psychological function of individuals with brain operation, and at the same time, psychology also tries to explain the role of individual psychological function in social behavior and social motivation; At the same time, it is also related to neuroscience, medicine, biology and other sciences, because the physiological functions discussed in these sciences will affect the mind of individuals. 4. Marketing, also known as marketing, marketing or marketing, as an important module of management and education managers, has been included in classic business management courses such as MBA and EMBA. Marketing is an activity, process and system that brings value to customers, customers, partners and the whole society in the process of creating, spreading, spreading and exchanging products. Mainly refers to the process of marketing personnel to carry out business activities and sales behavior for the market.