Currently, network media have become the second opinion field in China, especially, with the rapid development of blog and microblog, the people in China seem to stay in a unrestricted or rarerestricted space, therefore, the Public Sphere Theory of Jurgen Habermas, a representative of German Frankfurt School, becomes a hot topic being studied by domestic academic circle since his era. This paper discusses the rational construction of public sphere at internet era based on Chinese reality.