OpenAccess open access.

OA periodical is an action that international academic circles, publishing circles and library and information circles use the Internet to promote the free dissemination of scientific research results, and it is a substitute for the traditional subscription-based publishing model. Open source periodical is a kind of free online periodical, which aims to make all users get the full text of periodical papers through the Internet without restriction. Open source journals no longer use copyright restrictions to obtain and use published documents, but use tools such as copyright to ensure that documents can be permanently and publicly obtained. The journals published by Hans Publishing House in China are all OA journals, and scholars can read, download and disseminate them on the website for free.