Introduction carries great importance for writing a research paper. It is the first part of the work. Great attention is usually paid to the questions and ideas presented in that part. It is very easy to find an explanation to many questions in the introduction. First of all, it contains briefly outlined problems, described in the whole work. Then it explains the reason this or that topic was chosen for the research paper. Introduction should catch the readers’ attention. It should leave a good impression, so that readers would be interested in other parts of this work. Students need to learn some principles of writing an introduction. It will help them to write a paper of an excellent quality.