The article addresses the problem of distinguishing such genres of business language as product presentation and advertising speech. In the system of marketing communications, failure to distinguish such genres as product presentation and advertising speech often leads to the fact that they are not pronounced in accordance with the situation. In the context of trade presentations, a popular marketing event held today to familiarize the public with a new product, an important importance is the speech-presentation - informational speech about the properties and qualities of the product with a pronounced super task of forming the target buyer and inducing him to purchase. Advertising speech, urging specific listeners to make a purchase to solve their personal problems, is more appropriate in personal sales situations. Different tasks of these speeches determine the peculiarities of their content and construction.