The book is devoted to the most important issues of English phraseology. Based on the analysis of large factual material, it provides a scientific justification of English phraseology as a linguistic discipline. The author developed a method for studying phraseological units - the method of phraseological identification, the problem of stability of phraseological units and the dependence of their components, additional indicators of the separate form of phraseological units, the theory of correlation of the phraseological unit with a word.