1. Online inquiry: log on to the official websites of People's Republic of China (PRC) and the Ministry of Education or official website, and check the institutions and professional codes through the inquiry service.
2. Enrollment information: refers to the enrollment information provided by the school, such as "application guide" and "enrollment plan", which usually includes institutions and professional codes.
3. Consult the school admissions office: directly contact the school admissions office and consult the codes of related majors.