The Glagolitic Alphabet which was made by brothers Cyril and Methodius was made on the basis of dialects of Macedonia, Bulgaria and Thessalonika at that time. The evidence of this can be seen by a lot of literatures of comparative linguistics of the aforementioned dialects. It can be seen that there are proofs in a lot of comparative linguistic literatures. I argue Glagolitic alphabets, such as, , , , ,, Ѧ, , , , , ect. from the Ancient Greek also continued to be used in Cyrillic through a period of the transformation process, and such mixing showed a distinct change in depending on each Slav region in modulation method that occurred due to phonological similarity.