The article deals with extralinguistic and linguistic features, functions and factors which influence the definition of the official business style in English.Official business style occupies a unique position in the system of functional styles.The official business style performs the functions of declaring, informing, demonstrating and instructing internal legal relations between the state and citizens.In this regard, the present issue can be considered as an attempt to analyze official business English as a functional version of this language within the system, as a social phenomenon determined by the use of language tools in a specific communicative situation.The analysis focuses on special vocabulary, morphological means and syntactic structures, terms, stable and unstable combinations, official business standards and labels used in official business style texts.Characteristics of the official business style of modern English, lexical and grammatical norms and patterns, systematization constitute trends in changes in style parameters in official business texts.The main purpose of the article is to explore the official business style of the English language from the point of view of communicative style, lexical-phraseological and syntactic style, as well as to determine the main trends in the development of the official business style.The results of studying text materials related to the official business style of the English language clarify our ideas about the nature of this style.The material of the article provides new information about the specific norms, genres and functions of the official business style, its linguistic features: lexical-semantic, morphological and syntactic features, as well as the similarities and differences between the official business style and other styles.The method of complex analysis of this style can be used when describing other styles.The mentioned event is analyzed by considering the communicative situation within the categories of addresseeinformation -addressee.