The use of corpora in translation practice and studies has sparked discussion and attention over academic community in the past couple of decades. Much of this discussion and attention has explicitly recognized that what corpus-based research offers us is not a theoretical paradigm as such but a set of tools and methodologies which complement rather than replace traditional ways of researching and its future. It makes great sense to introduce the theory basis of Corpus and its application in the CAT translation. Besides, it makes an analysis and discussion about the potential of Corpus Translation Studies.