In this article is investigated the place of numeral names characteristic of the Kyrgyz literary language and their dialects in the Chagatai language. The commonalities of these languages were considered on the basis of the comparative-historical method, marked by specific examples. The views of scientists are studied on this issue . As a result of the work, based on the above facts, the names of numerals characteristic are determined of the Kyrgyz literary language and their dialects in the Chagatai language. More precisely, it is confirmed that in the Kyrgyz language and their dialects the functions of numerals, such features as the division into groups according to certain features in the grammar and vocabulary are characteristic of the Chagatai language. Therefore, it was concluded that the materials of the modern Kyrgyz language on the basis of historical and linguistic facts: close connection with the Chagatai language, the question of kinship, should be taken as an object of special scientific study.