In China's university system, colleges (departments) are units divided by major disciplines, while majors are more subdivided units under colleges (departments). When filling in the department, it should be determined according to the specific situation. If you are filling in documents such as academic qualifications or resumes, the department usually refers to your college or department, which is your subject category. If you choose a course or apply for a project, the department may refer to a specific major. Therefore, the specific meaning of the department depends on the context of filling in the document. If you fill in your academic qualifications or resume, the department should refer to your college or department. If you are choosing a course or applying for a project, then the department may refer to a specific major.