legal ground
Article 54 of the Regulations on the Administration of Students in Colleges and Universities
Schools should adhere to the combination of education and punishment, and adapt to the nature of students' violation of law and discipline and the severity of their faults. The school's punishment of students should be sufficient evidence, clear basis, accurate qualitative, due process and appropriate punishment.
Article 52
Students in any of the following circumstances, the school can be expelled from school:
(1) Violating the Constitution and opposing the Four Cardinal Principles, undermining stability and unity and disturbing social order;
(2) Violating national laws and constituting a criminal offence.