The purpose of this study was to examine what motivated consumers to purchase the products that they viewed from User Generated Content (UGC) on YouTube. The current research collected 198 YouTube users online survey on their attitude toward UGC, their perceived credibility of UGC, their user activity, parasocial interaction and their purchase intention of the products being reviewed. The results showed these examined variables were positive correlated. Additionally, active users and passive users not only held different attitudes toward UGC and different purchase intentions for the products being reviewed, but also the predictive power was varied.