Importance . In the process of teaching Russian to students of engineering and technical specialties, the advanced stage of training (language proficiency level B2) plays a special role, during which students improve their existing educational and professional skills. The process of teaching Russian at an engineering and technical university is carried out mainly on the basis of the scientific style of speech, and speech skills are formed through educational and scientific texts in the language of the specialty. In methodological literature, the concepts of “scientific style of speech” and “language of the specialty” are often confused. This important problem is the subject of this study. Materials and Methods. The base for the experimental research is the Military Institute (engineering and technical) of the Military Academy of Logistics and Technical Support named after Army General A.V. Khruleva. The research material is based on a corpus of errors identified in the process of analyzing the speech of non-philology students. The key research method is the error analysis method. Results and Discussion . The result of the study is: a) a methodological substantiation of the issue of the relationship between the concepts of “scientific style of speech” and “language of specialty”, presentation in the author’s methodological interpretation; b) definition of the nomenclature of speech skills that a foreign student should master in Russian language classes at an advanced stage of training: the content of Russian language classes is determined by the specifics of students’ activities in classes on special disciplines. Teaching specific lexical and grammatical features of these sublanguages is an important task in Russian language lessons. Conclusion . The scientific style of speech should be considered as a generic concept in relation to the language of the specialty and defined as its special case. In our case, we are talking about the engineering and technical specialty, which is distinguished as a variety of the scientific style of speech and includes sublanguages of construction disciplines. The skills developed in classes on special disciplines should be integrated into classes on the language of the specialty. In this regard, the development of the following skills is important: a) reading and listening to scientific texts; b) conveying the content of the read and listened to text in oral and written form (creation of secondary scientific texts); c) creation of primary scientific texts.