Polysemy means a single word having several or many meanings. According to Crystal，polysemy is a term used in semantic analysis to refer to a lexical item which has a range of different meanings. Polyscmic words arc signs of an advanced culture. Polysemy is also an essential feature of a language's economy and efficiency. Historically polysemy can be understood as the growth and development or change in the meaning of words. For example, table has several meanings, including a kind of furniture, form, tabulation, etc.