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Won-hoi Kim․Yoo-jung Chae․Jin-shil Kim. 2007. A Study on the Diachronic Changes of Old Slavic Vowel Systems and Ѣ(Jat'). Language and Linguistics 39, 57-73. This article aims to investigate the changes of Old Slavic vowel systems from the diachronic view points. And also aims to attempt the analysis of Old Slavic /Ѣ/. For this purpose, the author describes and compares the vowel systems of Pro Indo-european, Proto Slavic, Common Slavic and Old Church Slavic Languages. In this diachronic process we observe the following phenomena: (1) the loss of the old contrast with respect to the feature "tense", (2) the tendency to strengthen the oppositions of hight, front-back in the vowel system, (3) introduction of a contrast with respect to the feature "labial" in the high vowel, (4) general tendency in the system towards a more forward and more high vocalization. Old church slavic and contemporary Russian and Bulgarian show great variation with respect to the distribution of /Ѣ/ and corresponding /ä, e, i/ in various environments. We can explain these complex distribution of /Ѣ/ with the following reasons: (1) the different dialect basis of Old Slavic(concerning with /Ѣ/), (2) assumption of Ѣ as front, low, tense vowel in OCS (Old Bulgarian) and it's various phonological applications(for example, a(:)j → e: // ______ [C or #], Ѣ → ’a / ______ V[-front], Ѣ → e / ______ V[+front], [-stress]).