This thesis has made acoustic analyses of the experimental results of the initial and non-initial syllable short vowels, long vowels, diphthongs, fronted vowels as well as vowel harmony in Aga vernacular vowel system. 6 short vowels appear in the initial syllable and non-initial syllable of words. 7 long vowels appear in the initial syllable and non-initial syllable of words. 5 diphthongs /ei/, /ei/, /oi/, /oi/ and /ui/ appear in the Aga vernacular. From the analysis of sound intensity and pitch, Aga vernacular word stress is not fixed the first syllable.