The textbook reveals the basics of the theory and practice of the scientific style of the Russian language in the field of humanities, natural and exact sciences. The book deals with the substantive and structural features of the scientific text, some issues of grammar, terminology and phraseology of scientific style, as well as the main problems of teaching non-philological specialties to foreign languages. We offer original author's developments in teaching reading, listening to lectures, mastering the skills of oral and written professional speech . It can be recommended to teachers of the culture of speech and Russian as a foreign language, as well as to all those who wish to expand their knowledge of scientific style and improve their skills in the language of the specialty.