"Fen" is a common word in Chinese vocabulary with abundant meanings. With the popularization of the Internet and the progress of science and technology, all kinds of new words with "fen" as morpheme have appeared, and the part of speech and meaning of "Fen" have changed accordingly. This paper starts from the original meaning of "Fen", analyzes its evolution process, interprets the structure of "X Fen", explains the inherent meaning of "Fen", and explores the relationship between language and social development.