With the development of education informatization,modern education technology is gradually integrated into ideological and political education. Its teaching model has also experienced the transformation of offline teaching - online teaching - online offline hybrid teaching. Combined with the theoretical results and practical exploration of online teaching of ideological and political course, the research summarizes the“changes”and“invariance”of online teaching of ideological and political course; It is of great signifi- cance to study the historical context,teaching philosophy,teaching model,practical countermeasures and theoretical support of online teaching of the course. Through the research on the connotation of online teaching,the approaches are proposed to the construct online learning and offline classroom teaching methods with the same quality and efficiency,so as to realize effective share of high - quality teaching resources,and give full play to the ballast role of moral education of ideological and political course.