直播作為近十年新興的傳播媒介，在政治傳播領域的討論卻相當有限。本研究以對應推論理論作為理論架構，探討直播作為同步傳播的一種形式，如何使觀眾觀看政治人物的現場直播對其產生政治真實性，進而建立好感度與信任感。研究採問卷調查法，發現相較非同步傳播，觀看同步傳播能讓觀眾對政治人物認知到更高的政治真實性，且若觀看與自身政黨立場相同的政治人物，則效果更強，而政治真實性的提升亦會增加觀眾對政治人物的好感度與政治信任。 

 As an emerging tide in the last decade, however, live streaming has received limited discussion in the field of political communication. This paper takes Correspondent Inference Theory as a theoretical framework to investigate how live streaming, as a form of synchronous communication, can build the audiences’ perceived political authenticity upon politicians, which in turn create positive attitude and political trust toward politicians when they are watching Politicians’ live-streaming video. The study uses a Web survey and finds that synchronous communication leads to a higher level of political authenticity for audiences compared to asynchronous communication. Moreover, the effect is stronger if the politician shares the same party position with the audience. Finally, the increased political authenticity also increases the audiences’ positive attitude and political trust in the politician.