The article deals with the categories of cases in the Turkic languages. Turkic languages consist of applications such as suffixes and endings , according to their belonging to the group of connected languages. In the ancient Turkic script, there is a category of existing kinship, among the Turkic languages that are being updated and used today. However, due to historical and geographical changes, it is obvious that the neighboring countries have not suffered in terms of language. Despite the fact that the historical path of development and the nature of the formation of declensions in the Kazakh language is identical to other Turkic languages, there is a partial difference. It can be said that Kazakh scientists have deeply studied the system of declension and its semantic and personal nature. Special attention in the Kazakh language is paid to the formal system of cases, in the works of M. Tomanov the semantic structure of cases is analyzed. The article analyzes this issue in detail.