This study mainly analyzed how WeChat monopolies the social media market in China. Tencent used many marketing strategies to develop WeChat, for example, the Red Pocket function was cooperating with Chinese New Year to promote; and this also helped WeChat Pay to spread because the Red Pocket is Foot-in-the-door technique. These marketing strategies are valuable to learn and discuss the positive and negative impacts on the products. By analysis WeChat's developments, it is helpful to predict the future of the social media in China and it can provide some references for other social media products.