Language is a mirror reflecting the culture of a society.With the development of the society,almost all living languages are in a state of continuous change.As one of the main communication languages in the world,English not only changes,but also changes quickly.The most active and apparent changes of English can be seen in its vocabulary.Since the end of the World War II,a large number of new words have appeared in English vocabulary.At present,it seems that we are facing a new period of English vocabulary expansion.