The characters combine literally to mean “upper-flow society.” This paints a vivid picture of a social structure as a river, where the 上流社会 represents the top layer—the most visible, influential, and elevated part of the social stream.
Historically, the Chinese elite was composed of scholar-officials and landed gentry who gained status through imperial examinations and family lineage. While that system is long gone, the modern concept of 上流社会 retains a similar emphasis on more than just wealth. In contemporary China, entry into the 上流社会 is often seen as a mix of entrepreneurial success, political connections, and increasingly, prestigious overseas education. It's a world where `关系 (guānxi)`, or one's social network, is paramount. This differs slightly from the Western concept of “high society,” which might be more associated with “old money” and aristocracy. In China, due to its recent economic history, the 上流社会 is a more dynamic and, in some cases, newly-formed group. However, the importance of `面子 (miànzi)`—maintaining “face” or a pristine public reputation—is a critical value shared by elites everywhere, and is especially pronounced in this context. Attending the right galas, sending children to the right international schools, and belonging to exclusive clubs are all part of the performance of being in the 上流社会.
上流社会 is a common term in media, business, and social commentary.
It is a relatively formal term, more common in written Chinese or structured conversation than in casual slang.