Media plays an important role in promoting democracy. Providing audience with truthful and accurate information has always been an important function of media in advancing democracy. However, with the advent of “post-truth era”, the information providing function of media is being challenged. Based on the interview of professor John Keane, the mere emphasis on “truth” is not the best way for democracy to protect itself against “post-truth”. According to professor Keane, “post-truth” is a recombinant of “lies”“bullshit” “symbolic buffoonery” and “silence”. Within the “post-truth era”, through protection and establishment of multiple monitoring platforms, media can be the supporter of “monitory democracy”. What’s more, communication revolution and “monitory democracy” heightened the experience of the interpreted quality of the world. Although “post-truth” has the potential to destroy democracy, it also raises the question of what is truth among people and encourages farewell to “hard truth”. If media wants to continue promoting democracy within the “post-truth era”, it needs to help people learn how to make better interpretations and how to judge the conflict of interpretations, thus cultivating reasonable and wise citizens for the development of democracy.