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The purpose of this study is to investigate the effects of English suprasegmental teaching. For this purpose, eleven Korean speakers’ high-low range difference in F0 and speech time of sentences were measured and analyzed. In addition, vowel duration and pitch of stressed and unstressed vowels were assessed. After that, English suprasegmental characteristics such as intonation, stress and pitch were explained in detail and the subjects’ production changes in the suprasegmental properties were analyzed. The results are as follows. (1) Korean speakers’ high-low range difference in F0 after teaching about suprasegmental characteristics was not significant. However, after practical suprasegmental teaching, the difference increased to a small extent. (2) Speech time of sentences was shorter after teaching. (3) With regard to vowel duration and pitch of stressed vowels, pitch tended to change positively, whereas vowel duration did not. (4) Vowel duration and pitch of unstressed vowels were changed positively even though the change was not significant. These results show that the theoretical explanation of English suprasegmental characteristics is not sufficient to enhance Korean speakers’ pronunciation. thus indicating the necessity of a different solution.