With the development of modern digital technology, the alienation phenomena of public discourses occur in the public areas, such as proliferation of false information, over-commercialisation, and polarisation of opinions. The essence of such an alienation is that the public tend to become “the crowd” on internet and re-dominate discourse power in the form of carnival. The echo chamber of internet communication has led to the increasing alienation of public discourse. Ensuring authenticity of public discourse, maintaining objectivity and rationality, and discerning the facts and truthful discourse are the basic countermeasures to get out of the predicament of alienation of public discourse.