Compared with traditional media，producing subjects，text patterns and reception modes of online media have met great structural change in the age of big data. This kind of change has not only reconstructed the connotation and denotation of press freedom，but asked for new social responsibility of online media. Under this circumstance，Chinese government has put forward some regulations，in order to ensure the healthy development and social responsibility of online media. However，problems are following：the representation of conflict between online regulation and expression freedom，the outside pressure of online development and more hidden and complicated expression of cyber citizens under regulation. Consequently，in order to carry out effective regulation on social responsibility of online media，the following new adjustments are necessary：1. Promoting legal construction of online media；2. Creating new online communication mechanism. 3. Improving internet value system；4. Helping self-purification of online media.