College students include junior college students, undergraduates and graduate students (master students and doctoral students). There are two grades and three grades: (Grade two: advanced university-undergraduate; Universities-postgraduate higher education: undergraduate, master, doctor). No matter what kind of study. In the strict sense of international practice, the level of "bachelor, master and doctor" is the most important hierarchical form for college students. At present, 89% of China's talent market has a college education or above (headed by a college). College students refer to a group of people who are receiving basic higher education and professional higher education, have not yet graduated or have graduated from higher education and entered the society. As the frontier group of new technologies and new ideas and senior professionals trained by the state, college students represent young and energetic people, are the main force of pioneering construction and creation, and are the main group to promote social progress.