In recent years，the world-class social network applications represented by Facebook，Youtube，Twitter，Sina Weibo have had a profound impact on international public opinion pattern.Social network has become an important channel for governments to carry out international communication and public diplomacy.This article takes the event “Xi-Tramp meeting” as an example，to Twitter/Sina Weibo accounts operated by Chinese/American government and media as the object of study.The writer used the content analysis method based on the frame theory，digging and analyzing the contents published by Chinese and American Twitter/Sina Weibo accounts during Xi-Tramp meeting.This article compares the different understandings and concerns of the two countries on major issues such as “Sino-US relations”，“development of the two countries” and “regional situation”，summed up the two countries strategic communication patterns in the overseas social network，and finally put forward proposals to promote China's strategic communication capacity in international social network.