The flexible usage of idioms' semantic meaning is a very common phenomenon in advertising creative language. This phenomenon can be divided into two small categories: one is the reinterpretation of idioms, which is to use the rational meaning of idioms; the other is the changeable emotional meaning, which is intentionally change idioms' colorific meaning. The proper use of idioms' semantic meaning in the advertising creative language can add a new meaning to the idioms. It seems to become fresh, unique and easy to understand. What's more, it conforms with the requirements of advertisement originality. However, it will produce some negative effects for the correct use of the Chinese idioms and Chinese language more or less.