For the time being, there are still no standardized medical English teaching textbooks and reference books, with the result that numerous doubts and puzzles may have sprung up now and then. But now, with the dramatic spurt in technology, there is a new device---corpus-based approach---corpora of naturally occurring texts has moved from margins to occupy the center ground as the basic resource for language research. This study is to find out the possible objective means of identifying the core medical English words and phrases through their frequencies and the feasible ways of erasing the doubts and puzzles from the minds of teachers and learners by concordancing. In this study, the use of concordancing in medical English learning and teaching was discussed. For the time being, there are still no standardized medical English teaching textbooks and reference books, with the result that numerous doubts and puzzles may have sprung up now and then. But now, with the dramatic spurt in technology, there is a new device- - corpus-based approach --- corpora of naturally occurring texts has moved from margins to occupy the center ground as the basic resource for language research. This study is to find out the possible objective means of identifying the core medical English words and phrases through their frequencies and the feasible ways of erasing the doubts and puzzles from the minds of teachers and learners by concordancing. In this study, the use of concordancing in medical English learning and teaching was discussed.