The article reports that the beginning of A. Zhaparov's pedagogical and scientific activity falls on the 1950s, when he, as the author of the textbook, enriches the syntax of the Kyrgyz language with new discoveries, brings it into a certain system and provides a systematic , consistent presentation of educational material. The article analyzes scientific manuals, monographs, fundamental works of the scientist, emphasizes the depth of scientific and theoretical studies of syntax issues, the materials of which are presented, their novelty. It is emphasized that the object of the research work of A. Zhaparov was the actual topics of his time, such as the phrase and the main members of the sentence in the Kyrgyz language, after which the syntax became the doctrine of the phrase and the sentence, their boundaries were delimited, functions, syntactic relations were defined, the main members of the sentence were characterized , their syntactic functions are defined, their places in the sentence are revealed, and in general, the nature of the sentence is analyzed. In the two-volume fundamental work ―The Syntactic Structure of the Kyrgyz Language‖, the author analyzes in a wide and detailed manner all categories of the syntactic structure, covering both general issues and the structural features of simple and complex sentences, their functional stylistic peculiarities, taking into account the peculiarities of the Kyrgyz language. And the fundamental work ―Comparative Grammar of the Kyrgyz and Russian Languages‖ by A. Zhaparov made a great contribution to the comparative grammar of the Kyrgyz language