The purpose of this paper is to examine through experiment if Korean students learned sounds like /r/, /f/, /b/ and /v/ precisely, sounds which Korean doesn`t contain, and to discover methods whereby this learning may be accomplished. For this end, we prepared two kinds of test materials with 30 questions each, which consisted of minimal pairs with /1, r/, /f, p/, and /b, v/ in word-initial positions. In the tests, 40 third-year students from Janghang Technical High School served as subjects. The subjects were divided into two groups (an experiment group and a control group). The tests consisted of two steps. First, we examined each group`s listening ability of the above consonants in word-initial positions. Next, after teaching the experiment group the differences between the consonants above with special programs, we examined their degree of improvement. The results showed that the listening ability of the experiment group was more improved than that of the control group. In conclusion, although most of the subjects of the control group had difficulty in listening to the sounds that, Korean doesn`t contain, they could improve their listening ability of those sounds to some degree by learning the place and manner of articulation, and through repetitive practice.