The article deals with the peculiarities of formation and enforcement of the national investment security in terms of distribution of investment flows and demand for investments. The global market for investment resources was analyzed and its impact on the investment needs and security of the individual countries was evaluated. At the methodical level, the interrelation and interdependence of components of national investment security were defined. Leading security indicators were identified and characterized taking into account investment risks factors. A Process model of the country’s investment security system was developed considering the risks and threats from the external environment and economic issues from the internal environment. The algorithm of complex assessment of the investment security of a country, based on the identification of stages and components of use of investments at the national level, was formed. A Model for evaluating the country’s individual investment security measures was developed.