Correspondence is a learning form of adult college entrance examination (adult college entrance examination is a type of adult education), and it is also suitable for office workers and candidates with less spare time. Correspondence teaching mainly focuses on planned, organized and guided self-study, and organizes systematic centralized face-to-face teaching. The main links of correspondence teaching are: counseling and answering questions, homework, experiment, practice, examination, course design, graduation design and defense. Arrange centralized face-to-face lectures about three times a year 10 days or half a month. In colleges and universities that recruit teachers, the face-to-face teaching time is generally hot and cold.

Correspondence qualification is registered to participate in the unified national adult college entrance examination. After passing the examination, it will be accepted by all provinces and autonomous regions. Finally, it will be accepted by colleges and universities, and the admission notice will be issued, that is, the correspondence qualification will be obtained. Correspondence is a series of national education, and the state recognizes academic qualifications.