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In the research the opinions of the researchers such as Mehmed Fuad Köprülü, Nihad Sami Banarlı and Fevziye Abdullah Tansel are presented about Ottoman poets writing poems in Eastern (Chagatay) Turkish, and later the research focuses on various considerations on these contexts and publications of soıts of beyit, kıt’a, rubai, gazel, tahmis, mülemmâ in divan literature by Kemal Eraslan, Osman Fikri Sertkaya, Mehmed Çavuşoğlu, Ayşe Gül Sertkaya, Eleazar Birnbaum, Erkin Ahmadhocayev, ' Abdurrahman Güzel, Sigrid Kleinmichel, Zeki Kaymaz, Cemal Kurnaz and Mustafa İsen. In the second part of research the letter in Eastern (Chagatay) Turkish which is found in Milıışeât by Lâmi“î Çelebi and it is compared to the different writings of Münşeât and prosed and this statement is presented by its adaptation to Turkey Turkish