To give information about Çağatay Turkish that comes after Harzem Turkish in Timur Empire, the third period of improvment Islamic Central Asian Turkish (Eastern Middle Turkish) literary language and contains various indigenous dialects. To expose the linguistic structure of the period with examing texts.

Formation stages and cycles of Çağatay Turkish. Introduction of Literary, grammar works and dictionaries written with Çağatay and Kıpçak Turkish. The application works.