With the prosperous development of the industry of mass media，Reality TV Show has become a noticeable culture phenomenon as a new television genre. Although Reality TV is a kind of entertainment program，due to it’s feature of reconstruction of reality，it has been playing a key role in shaping a society’s mass culture and conveying the mainstream ideas and values. From the perspective of the construction of social gender，due to the media’s power on people’s behavior and ideas，the female images in media has great influence on the cognition of women、people and society. The popular American Reality Show Project Runway was chosen as the research subject to carry out a close reading and studying for this study. After the analysis of its role that has been playing on the construction of social gender，I come to the conclusion that reality TV should have positive influence on the construction of social gender in terms of women’s needs、social values、spirits、dignities，etc.