On the basis of the first two reports，this research takes 19 media WeChat official accounts as samples，comparative analyses the changes of their social responsibility through two years data. The results show that，compared with the previous year，the social responsibility score of the media WeChat official accounts in 2018，is generally on the rise. Especially，the party media and the web sites based on traditional media have a clear demonstration effect on the information production. And the score of building consensus has increased significantly. It has become a common consensus of the media WeChat official accounts. The social supervision function shows a different adjustment trend. The online communication function of central mainstream media’s on WeChat public platform is getting better. This series of changes reflect the effect of the mature development of WeChat public platform and the government network content regulation.