In modern conditions of unpredictability of economic activity, enterprises represent an open dynamic system.
Functioning and development of the enterprises is influenced by numerous external and internal factors. Multiple threats
of economic security may lead to negative consequences in form of solvency and financial stability violations,
profitability reduction and other deterioration in the enterprise. In this regard, the relevance and the need of ensuring
economic security of enterprises are increasing. The issues of economic security are relatively new to the national
science. At the same time, a sufficient number of scientific literature devote to this topic. In this article is presented the
analysis and the systematization of various definitions of economic security. On its basis, the authors have identified
five main approaches. The relationship between economic security and other economic categories such as sustainability,
effectiveness, development and independence was explained. In order to counter threats of economic security and to
ensure stable functioning of enterprise, the system of economic security is developed and presented in the paper. Under
this system, main ways of increasing the level of economic security of enterprises was presented. Ensuring of economic
security of each enterprise serve as a basis for sustainable development both businesses and the economy as a whole.