Livestream sales is an innovative application of social media in business. Under the Covid-19 pandemic, physical stores have been greatly affected, but livestream sales, as a new form combining social media and e-commerce, has become a breakthrough for the retail industry. Livestream sales, emerged in recent years, is still at a stage that needs further research. This paper analyzes the functions of main participants in livestream sales and the connection between them and then proposes a business model. In particular, the main components of livestream sales are summarized as 3Ps --People, Product and Place. People refers to those who conduct the livestream sales, which include key opinion leaders (KOLs), celebrities, founders/CEOs and government officials. Regarding product, this paper analyses different type of product suppliers. Place refers to the livestream sales channel, mainly divided into e-commerce and social platform. Suggestions for the better application of livestream sales will be presented, which can provide implications for retailers who want to apply livestream sales in their business.