Business letters play an important role in the professional activity of a specialist. In order to write a correct business letter in accordance with the accepted rules and regulations. Currently, business correspondence is actively conducted in most cases, regardless of the field of human activity by e-mail. In order to teach a foreigner to write a business letter, the teacher is to have an idea of how to compose an electronic message. He has to know certain methodological characteristics of business letters, which will make it possible to create a methodological characteristic of business letters. The authors of the article identify the methodological features of business letters: content, function, composition, one-aspect/multi-aspect, simplicity/complexity. Taking into account the basic level of foreign language proficiency, the authors of the article compiled a methodological characteristic of business letters in order of complexity. For A2 level, the genres were distributed in the following order: business letter (invitation, response to invitation, congratulations, response to congratulations, gratitude, response to gratitude); standard documents (questionnaire). B1 Level is represented by such genres as a business letter (commercial letter, response to a commercial letter, advertisment); standard documents (preliminary application, visitor's questionnaire; act of delivery and acceptance of goods). The presented genres should be taught in the future. Taking into account the specifics of each of the genres, further articles will describe the method of teaching writing business letters.