The study of metaphor has gone beyond the mere understanding of metaphor withln language ltself. The pervasiveness of lts role In the understanding of our world and ourselves arouses more attention ofmany scholars Invarlous fields.The default of traditional comparlsontheory of metephor are Increasingly reallied for its powerless accounting on many phnomena In Speclnc comexts． The doubts of the existence of a criterion for meqhor leads to the great concern on the way people understand their language and experience． that Is the principles on which metaphors function．Modern cognitive and practical linguists，psychologists and educators hold he position that human thought processes are largely metaphorical and， because of this，the human concepal system Is metaphorically structured and defined.