In recent years, live streaming techniques have been rapidly improved. It has created the era of digital media on web. However, there is few studies about the streamers. Based on social cognitive theory and social presence theory, this study tried to explore the reasons of motivating people to live broadcast their professional skills. The variables, popularity motivation, achievement motivation, sociable self-efficacy, live-streaming ability self-efficacy, perceived interactive richness, social influence and privacy risk, were concerned. The findings indicated that popularity motivation, sociable self-efficacy, perceived interactive richness, and social influence have significant impacts. Moreover, we found the influencing factors between male and female are different.