Under the conditions of the dynamic development of international integration and an exchange of professional information English was adopted as an operation language in international business and has become a tool of effective transmission of professional information. Manual LSP: English of Professional Communication is grounded on the result of scientific research in the field of stylistics. In the twenty-three chapters described are the features of each specific variant of English exposed in system: lexicon, grammar, syntactic structures and composition patterns. Each chapter gives a systematized review of specialist terminology and patterns of design: contract, business letter, power of attorney, minutes, etc. The book is furnished with a glossary and a list of references. The manual serves as a tutorial for all those who are engaged in linguistic research - students, postgraduate students and academics. Considered are not only the concrete steps of scientific research, but also the schemes and samples of description of the results of research such as a course work or a thesis.