Official periodicals generally have domestic authorities and detailed mailing addresses, and the printing and publishing places are all in China. In addition to self-issuance, most of them are subscribed by post offices, so there are often postal codes.
Many people have misunderstandings about the classification of periodicals. For example, the level of a journal is determined by the level of the supervisor or organizer, and then the level of the paper is determined; Journals headed or sponsored by the Ministry of Science and Technology, the Ministry of Education, the Ministry of Health and national societies or associations are designated as "national level", and those headed or sponsored by provincial administrative or academic institutions are designated as "provincial level". Taking medical journals as an example, the journals sponsored by Chinese Medical Association are designated as "national journals" and those sponsored by Provincial Medical Association are designated as "provincial journals". These grades are unscientific. At the end of 2002, the Information Department of the General Administration of Press and Publication gave a unified answer to such questions: there is no difference between national journals and local journals.