Tianjin polytechnic university can't change his major at once when he goes to college. He must wait until the end of his freshman year. If he wants to change his major, he must apply to his department and then meet the requirements of changing his major.

Tianjin polytechnic university (referred to as TJPU), referred to as Tiangong University, is a public full-time institution of higher learning in Tianjin and a full-time ordinary institution of higher learning in Tianjin. This school has a long history. The earliest department was established in 19 12. It is a multidisciplinary university with work as the center, combining work with study, and coordinated development of engineering, science, literature, management, economics and law. Have a complete education system to train bachelor, master and doctor, participate in the national "863" and "973" plans, and work in the Ministry of Education.