According to Yaya Encyclopedia, the first two represent the year of admission, the last two represent the college code, the fifth represents the professional code, and the last three represent the student's personal serial number. Specifically, the 1-2 digit of the student number represents the year when the student entered school. For example, the top two students enrolled in 20 19 are19; The 3rd-4th digits represent the code of the college where the students are located, and each college has a unique code identification; The 5th-6th digits represent the codes of the majors studied by students, and each major also has a unique code identification; The last three digits are student serial numbers, which are used to distinguish different students of the same major in the same college.