According to different publishing houses, it can be divided into government publications, government organization publications and general publications; According to the distribution method, scope and object, it is divided into internal reading and public publication. According to binding, books are also divided into hardcover books and paperback books. With the invention and application of phonograph, microfilm technology, recording technology, video recording technology and computer, new non-printing publications have appeared, namely records, microfilm, audio tapes, video tapes and CD-ROMs. , which is commonly referred to as micro-reproduction, audio-visual materials and electronic publications. Mainly divided into newspapers, periodicals, books, audio-visual products, electronic publications and Internet publications. After the invention of microfilm, audio recording and video recording technology in the middle and early 20th century, electronic computers became the media to spread all kinds of information. The production of microfilm (roll), audio tape, video tape and floppy disk that have been copied by different technical means and have certain communication functions is also called publishing. Such products are also regarded as publications, also collectively referred to as audio-visual books, or simply referred to as microfilm, audio-visual materials and electronic publications respectively. With the progress of modern technology, there will be many new developments in the material form and content of publications.