Management disciplines can be divided into two categories according to their nature. One is the "management" in the traditional understanding of most people in society, which focuses on qualitative analysis and research, and its representative direction is enterprise management and operation management. Through case analysis, experience summary, abstract promotion and summary, the management theory is mainly expressed by text; One is based on quantitative mathematical analysis, especially through mathematical modeling to study and analyze management objects, and its representative direction is "mathematical analysis management" with mathematics as the main carrier, such as quantitative economics, industrial engineering, management information system, operational research (application) and operation management. The main direction of management discipline in Tsinghua Institute of Economics and Management is mostly the study of the latter. For example, its trump card is professional management science and engineering, technical economy and management. The requirements for mathematics are very high, which is roughly equivalent to engineering. Many schools (such as the management science direction of Tsinghua Economics and Management) study mathematics not as calculus in general economic mathematics, but as mathematical analysis. Because this kind of management needs to have a very solid mathematical foundation, many schools of economics and management or related disciplines based on this research direction often take the math I in the postgraduate entrance examination, and it's not just the economics and management in Tsinghua. Famous universities with engineering backgrounds, such as Beihang University, Peking University and Tianjin University, will also take Mathematics I in their schools of economics and management, but they will cross management when taking the postgraduate entrance examination, so it is often difficult.