Abstract: The online teaching mode of ideological and political course is one of the important contents of the reform of university ideological and political science courses, which is not limited by the venue and has advantage of expanding the dissemination of excellent educational resources. This is conducive to promoting education equity and the improvement of education quality. The research on the effectiveness of the online teaching mode in the epidemic-battle ideological and political course is conducted mainly through questionnaires distributed to students, interviews and video conferences with teachers. This can profoundly analyse the advantages and shortcomings of online teaching, and provide possible countermeasures and ideas to promote further reform and innovation in the teaching philosophy, teaching content and teaching forms of university ideological and political courses.