The ideological safety in colleges and universities has a decisive role on overall national safety and development， and systematically preventing their ideological safety risks is a proper meaning of safeguarding the overall national safety. In the context of digital era， their potential risks of ideological safety include the network's "mimetic environment" dissolving their authority as the main channel for mainstream ideology education， the network's "over?entertainment" lowering their sense of identity on mainstream ideology， the "information cocoon" clogging their ways to publicize mainstream ideology， and the "information disorder" weakening their validity to publicize mainstream ideology， and so on. In this regard， colleges and universities should systematically improve their ability to prevent and resolve ideological safety risks via adhering to the overall leadership of the Party， strengthening national safety education，enhancing students' safety awareness， improving safety governance ability， and managing cyberspace in accordance with the law.