Most recent studies on vowel qualities utilize t-test or ANOVA the way in which each formant, F0 to F3 were analyzed independently. The main purpose of this paper is to identify vowels of Korean and Japanese with a tool of statistical package, Discriminant Analysis on which all independent factors are entered at once. As a result, data collected in this paper reported Korean vowel /a/ is classified into /Λ/(16.7%), /u/ into /o/(16.7%), /o/ into /Λ/(25%) and vice versa; otherwise, each Japanese vowel was all classified into its own category(100%). It turned out that the phoneme boundaries of Korean vowels were less clear-cut, which has the more complex vowel system than that of Japanese. (Hankuk University of Foreign Studies)