The Sinhala language is characterized by the melodic shifty stress or its essence, the opposition between long and short vowels, the Ablaut variants of the vowels and the syllabic alphabet which, of course, might impact the vowel harmony and can be a feature of all the leveled Indo-European languages. The vowel harmony is a well-known concept in linguistics. One may not comprehend that in a word; every single vowel is used according to some specific rules, which are sure to influence one another, and no other vowel can be used instead of the one at its definite place without the change of the sense of the whole word. The illustrated material which is taken from the research is, of course, in no way complete. The methods used in the project study are various; from the methodological overall selection of the words and word-combinations to generalizing tables conclusions which could help to better understand the nature of the VH dependence. The words/word combinations were divided into groups according to the number of closed or opened syllables. (Contains 48 tables.)