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The use of corpus linguistics in ELT has become a new tendency. At the beginning, a historical retrospect is given to clarify the historical development of corpus linguistics. Afterwards, the various definitions of corpus linguistics are discussed in detail, and a personal perspective is put forward after citing the dispute about corpus linguistics. In the second place, the four criteria of a corpus are classified.Meanwhile, four characteristics of corpus linguistics are enumerated. In the last place, the oversea and domestic applications of corpus linguistics in ELT are listed, and Data-Driven Learning is presented as a typical example.