Some of the first-class universities in China implement the college system, while others implement the department system.

The implementation of the college system means that the school has a college, a college has a department, a department has a major, and a major has a class.

The implementation of the department system means that the school has departments, majors and classes. Departments in universities are divided by disciplines, colleges are bigger than departments, and colleges are divided by disciplines. In other words, the university is divided into several secondary colleges, and each secondary college has several departments, and each department has several undergraduate or postgraduate majors.

For example, Peking University has the School of Mathematical Sciences, the School of Information Science and Technology, the School of Physics, the School of Environmental Science and Engineering, the School of International Relations, the School of Basic Medicine, the School of Engineering and the School of Foreign Languages.

The above institutes of technology have departments of industrial engineering and management, mechanics and aerospace technology, energy and resource engineering, biomedical engineering, advanced materials and nanotechnology. In front of the Department of Mechanics and Aerospace Technology is the undergraduate major of theoretical and applied mechanics.

For example, the School of Mathematical Sciences includes the Department of Mathematics, the Department of Probability and Statistics, the Department of Computing in Science and Engineering, the Department of Information Science and the Department of Financial Mathematics. The department of mathematics has undergraduate majors in mathematics and applied mathematics.