The article explores the basic professional communicative knowledge, skills that mechanical engineers must have; in this article we give their definitions in the process of fulfilling professional duties, give a description of the profession mechanical engineer considering business communication. The article defines a professional program as information about a complex of general and special professional knowledge and skills necessary for a specialist to ensure effective communication as a component of his professional activity. In the article we define the following basic criteria for the professional ability of a mechanical engineer: mastery of a sufficient supply of communicative skills and experience, knowledge of the basics of a communicative culture that facilitate communication and help to establish proper relationships for the sake of high one's achievements in a specific professional field.in their future professional activities, mechanical engineers must demonstrate the ability to negotiate, reach out to the audience, build relationships with colleagues on an ethical basis, resort to non-standard language forms, ensure cooperation in the group, as well as ability to avoid conflicts and respond promptly to the interlocutor’s comments in professional communicative situations, anticipate the development of the conversation and the interlocutor’s reaction, create and maintain a friendly communicative atmosphere for success in cooperation.