Young people represent the future, and youth is an eternal topic. In the 1970s when the American anthropologist Margaret Mead published her famous work "Generation Gap," research on generations gained sudden popularity worldwide, and ever since the 1980s when "Generation Gap" was brought to China, research by scholars in this country on the subject of generations has been on the rise. This article seeks to define the term "generation" and then trace the evolution of the concept as it became transformed into the current "Post-XX."