Abstract: In the Internet era, the occurrence of sudden events can easily pose a threat to online ideological work due to their rapid spread and amplification on the Internet. As the frontline of ideological struggle, colleges and universities should recognize that strengthening the dominance of online ideological work is of great positive significance for social stability, school development, and talent cultivation. This paper summarizes the current risks and challenges faced by colleges and universities, such as the infiltration of Western culture weakening the mainstream ideology, online public opinion caused by sudden events, low awareness of online ideological security among college students, and the increased difficulty of ideological work due to the development of online media. It proposes strengthening paths from aspects such as coordinating multiple subjects, enhancing professional education, innovating working methods, and improving the prevention and control system, in order to enhance the initiative and long-term effectiveness of online ideological work in colleges and universities.