Due to the rapid development of new media technology and industry，the past research on media trust has not applied to the current pluralistic new media environment，while COVID-19 has highlighted the issue of trust in new media. As the internal requirement of the construction of new media social responsibility，new media trust brings new problems to the performance of its social responsibility. In this context，what changes have taken place in the trust origin of new media compared with the credibility of traditional media，and in this process，the trust forms of different types of new media，the problems and the trust construction of users have become the focus of new media trust research. In terms of Social Responsibility Evaluation of new media，the performance of social responsibility of new media in 2020-2021 is in the upper middle level，with the average score of 3.416982 and the score rate of 68.33%，which is significantly better than that of 2.496563 and 49.93% in 2019. Specifically，the score rate of the four first level indicators from high to low was information production（81.34%），value guidance（57.19%），culture and education（54.27%）and coordination and communication（54.18%）. The quantitative analysis results of this report comprehensively present the current situation of social responsibility of new media in 2020-2021，and according to the communication characteristics of different types of platforms，put forward the optimization scheme of social responsibility.