Management is a multi-branch discipline system. According to the different research objects, management is subdivided into many branches. According to the subject classification catalogue of the Ministry of Education, management science consists of management science and engineering (management and engineering degree can be awarded), business administration (accounting, enterprise management, financial management, marketing, human resource management, tourism management, technical economy and management), agricultural and forestry economic management (agricultural economic management, forestry economic management) and public management (administration, social medicine and health management, educational economy and management, society). Cheng Siwei, a famous scholar in China, put forward the discipline structure theory of "three foundations, three levels and three fields" in Chinese management. That is, the three foundations of 1 are mathematics, economics and psychology. Mathematics is the basis of quantitative analysis methods in management science, and statistics (including mathematical statistics, regression analysis, nonparametric statistics, etc. ), combinatorial mathematics (mainly studying problems of existence, counting and optimization) and mathematical programming (including linear programming, nonlinear programming, integer programming, dynamic programming, objective programming, etc. ) is the most commonly used. Economics is the starting point and destination of various decisions in management science. Theoretical economics (mainly including microeconomics and macroeconomics), applied economics (such as industrial economics, labor economics, regional economics, international economics, etc. ) and econometrics are the most commonly used. Psychology is a science that studies people's psychological activities and behaviors, and it is the basis of studying interpersonal relationships and mobilizing people's enthusiasm in management science. The most commonly used are industrial psychology, social psychology and cognitive psychology. Three levels Three levels are basic management, functional management and strategic management. Basic management is the basic theory and technology of management, which mainly includes management mathematics, management economics, management psychology, management accounting, management organization, management decision, management history and so on. Functional management is the combination of management foundation and specific management functions, such as planning management, financial management, personnel management, production management, marketing management, science and technology management, international trade management, public management and so on. Strategic management includes the formulation and implementation of strategy, which is not only based on management foundation and functional management, but also includes political science, law, sociology and other knowledge. The three fields are basic management theory and method, enterprise and institution management, macro management and policy research. The basic theories of management mainly include management philosophy, decision-making theory and organization theory. Management methods include not only basic technologies such as prediction, evaluation and optimization, but also basic methods such as enterprise reengineering, strategy formulation and cost control, as well as basic means such as management information system and decision support system. Enterprise management includes the management of all kinds of enterprises in China, which is roughly equivalent to the management of foreign enterprises, while the management of public institutions mainly refers to the management of science and technology, education, culture, health, sports and other public institutions in China, which is different from the management of foreign non-profit organizations. China's macro management mainly refers to the management of state and local affairs by government agencies, which generally corresponds to the management of foreign public affairs, while China's policy research generally corresponds to the policy research of foreign public affairs.