Idioms are essence of a language and a kind of special and fixed phrases or short sentences in the long period of lan-guage use. Because animals have been considered as people's best friends for hundreds of years, people adopt different species of animals as metaphors to express all their emotions. However, due to the different national characteristics between English and Chi-nese, such as geographical conditions and tradition so in most cases easterners and westerners have different attitudes and under-standing towards same animals,of course, some animal idioms have the same meaning.