Mahmud Kashgari is the first researcher of turkic languages, great son of turkic people, created classification of turkic languages on the location of turkic tribes and on variants phonology and morphology. The Researchers-turcologists of ХХ century continued to classify turkic languages on the method of М. Kashgari. In connection with that in labours reasons of branching of turkic languages do not open up for classification of those turcologists. To correct the lacks of those turcologists an author in the article exposes reasons of separations of turkic languages on different groups. He distinguishes one of these reasons, as hybridization of turkic tribes with different ethnoss, that renders a large role in the division of turkic languages. And also he classifies on territories of turkic people on three groups.