Germany's dual system is a vocational training system with enterprises and students as the main body, vocational schools as the auxiliary and government supervision and support.
Enterprise training teachers and vocational school theory teachers are two types of teachers with dual system. Training teachers is the key and important teacher in the dual system. This kind of full-time or part-time training teachers are provided by enterprises. Generally, they are graduates of "Master School" with more than five years of professional practice after completing the "dual system" vocational training, or graduates of various "junior colleges" with two years of professional practice after completing the "dual system" training. Only by passing the examinations of pedagogy and psychology can you become a practical teacher. Theoretical teachers in vocational schools are college graduates who have undergone four years of professional study and two years of normal study, followed by teaching practice and passed the national examination again.