Postgraduate entrance examination mathematics refers to the mathematics subjects that take part in postgraduate entrance examination. According to the different examination subjects, mathematics for postgraduate entrance examination can be divided into three types: mathematics I, mathematics II and mathematics III. Mathematics I mainly includes advanced mathematics, linear algebra, probability theory and mathematical statistics, and is the most basic subject in graduate mathematics. Mathematics 2 covers mathematical analysis, ordinary differential equations, complex variable functions and real variable functions, which is deeper and more comprehensive than mathematics 1. Mathematics 3 mainly includes discrete mathematics, graph theory, optimization and computer mathematics, and pays attention to the study of discrete mathematics problems. Different types of postgraduate mathematics correspond to different test sites and test difficulty. Candidates can choose appropriate math subjects for preparation according to their own interests and preparations.