The article is devoted to investigate the problem of creation and improvement of country's infrastructure based on public-private partnership (further referred as PPP). As an object of research, authors look at public relations, that arise during the implementation of projects under the framework of the PPP law. The article considers the norms of the PPP law, as well as other laws, that regulate various aspects of agreements under PPP. As a result of conducting research, authors conclude that first of all, the difference between PPP and other forms of collaboration between the state and private sector (e.g. rent, privatization) is in its private principles, legal mechanisms and forms of realization. Such relations require a well-developed normative-legal basis. Secondly, the main idea of the stated law is not the opportunity for the private party to purchase the object of the agreement, but a wide opportunity to develop an effective form of PPP. Given this, authors point out, that the law about PPP possesses a number of features, that need to be considered alongside with various branches of legal rights. After the law was accepted, there was a need to reconsider a number of normative-legal acts of federal and regional significance in the aspect of public investment and budgetary guarantees. Given this, it is necessary to investigate the problems of public-private relations regulation in a complex manner, which will allow to define the key directions for the development of this institution.