On the basis of the original teaching system, the online teaching platform integrates the main subsystems needed for online teaching, and constructs a relatively complete online teaching support environment, from the comprehensive support for the teaching process (courseware making and publishing, teaching organization, teaching interaction, learning support and teaching evaluation) to the teaching organization and management (user and course management), and then to the integration with the online teaching resource database and its management system. With the development of internet technology, database technology and multimedia technology, the demand for learners' participation is increasing, and the understanding of distance learning under the network environment is getting deeper and deeper. The online teaching platform can be divided into three generations: the first generation: the on-demand teaching platform mainly realizes the rapid transfer of teaching resources in the early stage of online education development. Students can request audio and video courseware, consult electronic lesson plans and complete online homework anytime and anywhere. Its main features are courseware-centered, online electronic display of educational resources and emphasis on management. The second generation: the interactive teaching platform widely uses instant messaging technology to provide online and offline teaching support services. The teaching platform integrates video conference system, virtual classroom system, chat tools, BSS discussion system and internal e-mail system, and provides students with services such as learning navigation, online and offline courses, answering questions and counseling, discussion and online self-test, so as to improve the level of teacher-student interaction and the learning effect of students. Its main characteristics are student-centered, strengthening the interactive function of the teaching platform, and emphasizing the timely and effective service for students. The third generation: the rapid development of social teaching platform internet technology, the strengthening of globalization trend and the proposal of socialization of learning. Learners use the social teaching platform to build their own learning networks, including resource networks and partner networks, through social software such as intelligent search engines, RSS aggregation, blogs (using comments, news and citation announcements) and Wiki, and are in a state of continuous improvement and optimization. Its main characteristics are socialization, the sharing and creation of collective wisdom, and the emphasis on socialization of learning.