The purpose of this preliminary study on Korean vowel duration was to find how different syllable types and kinds of plosives influence vowel duration. The vowel duration of the Front Mid and Low vowels (/$varepsilon$/(에), /e/(어), /${ae}$/(애), /a/(아)) was found to be longer than that of High and Back vowels (/i/(이), /i/(으), /u/(우), /o/(오)). Compared with single vowels (V), Vowels followed by a consonant (CV) were shortened by 79.3% and vowels between consonants (CVC) were shortened by 38.5%, respectively. These results suggest that the influence of consonants upon Korean vowel duration depend on syllble types and the manner or place of articulation.