社群媒體迅速普及，連帶社群商務益發受到重視。本研究藉助S-O-R模型，期能以建立使用者之行為模式觀點的架構探討社群商務參與意圖。本研究中，欲探討營造社會臨場感的關鍵技術性特質對於社會臨場感的影響，進而對於促成參與意圖的效果，並瞭解媒體豐富性的調節作用。本研究蒐集相關文獻，並設計問卷、透過大量樣本進行研究模型驗證。 本研究共回收1218份有效問卷，並透過最小平方法(PLS)進行有效樣本之實證分析。研究結果發現，感知社交性是營造社會臨場感的關鍵技術性特質；同時，臨場感對參與意圖也有顯著的正向影響。即在社群平台上的社交氛圍、能與好友們社交互動，是最能使人感受到身歷其境的臨場感，也最能使人產生社群商務的參與意圖。 根據研究結果，本研究建議發展社群商務的過程中，在建置社群平台時，需要考量的技術性特質應特別著力於社交性內涵，如此是能產生社會臨場感，以及愈能促成社群商務參與意圖。 / Social media is well widespread, so is Social Commerce. With the use of the S-O-R Model, this study expects to establish a comprehensive structure to investigate the social commerce intention. This research proposes a view on the effect of technological features and social presence on social commerce. This study intends to identify the key technological features which enhance the perception of social presence. Furthermore, we intend to understand whether social presence contributes to the social commerce intention and the moderating effect of the media richness. We collected relevant literature, designed the questionnaire and validated the research model. A total of 1218 valid samples were collected to validate the research model. The result shows that perceived sociability is the key technological feature that leads to the perceived social presence, and social presence positively impacts social commerce intention. The analysis results imply that by making a great effort to enhance users' perceived social presence, social platform marketers can expect fruitful business result.