Double major is an educational model combining vocational education with academic education. In this mode, students can learn theoretical knowledge in universities and carry out vocational training in enterprises. The purpose of this educational model is to enable students to gain practical work experience while learning theoretical knowledge, so as to better adapt to future work.

Different universities may have different dual-system professional training plans. For example, some universities may adopt Wochenmodell, that is, vocational training is conducted in enterprises three days a week and theoretical courses are studied in universities two days a week; Other universities adopt Blockmodell, that is, vocational training and university study alternate every three months or 12 weeks.