Under the loading of network technology, internet ideology is increasingly imprinted with the "post-truth" characteristics of false rumors obscuring real information and emotion driving out rationality. The out-of-focus mimetic environment of truth and falsehood, the deepening digital divide of truth and falsehood, and the entropy of information dissemination of truth and falsehood are the typical post-truth symptoms of internet ideology. Inquiring into the causes of the loss of "truth" in internet ideology, there are mainly emotional supremacy irrationalization, individual-driven decentralization, negative orientation bias, diversification of participating subjects, and iteration of external intrusions. To deal with the post-truth symptoms of internet ideology, we need to apply for the right medicine, insist on the basic principles of creating a beneficial mimicry environment, controlling digital resources and identifying ideological problems. On this basis, it is also necessary to pay attention to macro and micro strategies, to respond positively, limit the flow of negativity, and divert the flow of the side at the macro level; at the micro level, to promote the iterative renewal and integrated development in the era of all-media, to do a good job of setting the agenda of "positive energy", "manageable" and "well used", to release the self-built autonomy of industry associations and head media, and to cultivate the media literacy of individual delayed judgment, rationality and calmness, and the ability of searching for evidence.