Quatrain is one of the most popular forms of Persian folk poetry. In the early literary works and in different regions in Iran, various names are used to refer to Quatrain: Fahlavi, Tarā ne, Hā jiyā ni, Qaribi, Faryā d, Š arve and so forth. The question is if these different names correspond to different genres with distinct characteristics, or they are merely different names that all belong to one autonomous genre, based on the generic and literary criteria. To answer this question, the structure and content of approximately five thousand three hundred Persian Quatrains were studied, including Č ā rbeiti, Seytak, Š arve, Ferā qi, Faryā d, Falaki, Kallegi, Hazā ragy, Hoseinā , Najmā , and Š arbe. The results show that, based on the generic and literary criteria, all of the above-mentioned have the same structural and content features and should be classified under the Quatrain genre.