The development of Mobile Internet and social media has reshaped the information exchange and interpersonal mode. Micro-video as a result of the current audience's audio-visual habits become popular increasingly，and also widely used in the national image construction during the 2016 global attention G20 Hangzhou Summit.In this paper，we selected 24 micro-videos which published by China Daily on the Facebook page of the G20 Hangzhou Summit，and analyzed the characteristics of the samples from the aspects of theme，perspective，duration，music and subtitles using the method of content analysis and qualitative analysis.The study found that：from the audience point of view，to avoid the seriousness of the theme，the use of multiple perspectives，to seize the viewer's attention characteristics，with music and subtitle can enhance the text of the close，help to achieve the effective construction of national image；Analysis the comments found that Facebook users overall give positive evaluation to micro-video and the image of China，but due to stereotypes the negative comments still exist objectively.