Euphemism is a relaxed, cheerful words to express unpleasant, sad, hard to say or not lucky. Politeness principle is that people generally follow the activities of daily communication is an important principle. In life, people tend to listen to some words, the session are to meet the needs of the people that mind, in communication often conceal the truth at all in breach of the Cooperative Principle, Politeness Principle, use nice words to benefit each other to achieve their communicative purposes. However, due to language used in a certain extent by the language user's age, educational status, life experience and other factors, the session the two sides in the use of these criteria used in different ways polite, it was used implicitly, some people use euphemism way. According to the "Longman Dictionary of Contemporary English" explanation, is a euphemism for a more pleasant sound than the name of indirect expression that are considered unpleasant things, language form, is the essence of euphemism trying to cover up or play down the number of landscaping is often considered taboo, sensitive or embarrassing things, the use of euphemism in fact, a fundamental purpose is to make each other feel good you do not force others, do not make no steps to the next, so we can Euphemism is that in real life people to follow the principle of polite discourse is often used in a way.