Classification and development trend of teaching AIDS, teaching AIDS in primary and secondary schools can be subdivided into 10 categories. After the implementation of the new curriculum standard, all kinds of publications show different development trends, both difficult and good. The specific performance is that synchronous teaching AIDS intensify competition and increase risks. Synchronous teaching AIDS account for the largest proportion in the market of teaching AIDS, which can be roughly divided into class synchronization, class synchronization, unit synchronization, and synchronization of various learning segments. At present, the repetition and vicious competition of a large number of topics lead to a serious backlog of such supplementary books and a serious return, resulting in a large waste of publishing resources. At the same time, it has also caused the present situation of high risk and low return of this kind of teaching AIDS. The suffocating market competition has really discouraged many industry leaders. In addition, synchronous supplementary books have strong timeliness, that is to say, synchronous supplementary books must be published before the start of school. If they are not sold 2-3 months after the start of school, almost all the synchronous supplementary books of last year will become obsolete because the textbooks of the new curriculum standards are changed every year. Therefore, the operation risk of synchronizing auxiliary books is increased.