Jiuzhaigou Earthquakeis a typical earthquake in the era of social media，and its rumor propagation and refutation process present unique characteristics.At present，the social media era has the posttruth characteristic，which means that people don't care about the truth anymore，but only care about the position，attitude and emotion.The earthquake rumors，which carry the atmosphere of terror，are vulnerable to spread into panics.After Jiuzhaigou earthquake，there were a large number of rumors，but those rumours were all refuted quickly，presenting a phenomenon which was not suit the post-truth characteristic in the social media era.It's worth analyzing the phenomenon.In this paper，starting from the specific rumors of Jiuzhaigou Earthquake，the process of rapidly dispelling rumors is analyzed.It is the timely disclosure of information from government that controls the rumors，holding the whole public opinion environment，providing a good background for the media and the active participation of the public.Media using a variety of ways to report is also the fragmental supplement to those official reports，and the active participation of the public is the promotion for the refutation of the government and the media.This kind of positive resultant-action mechanism not only makes the rumors in Jiuzhaigou Earthquakewere quickly refuted，but also provided a good experience for the future rumors refutation.