Functioning and development of enterprises of the young Donetsk People's Republic is complicated by an economic blockade from the side of Ukraine, by military operations, break of traditional economic connections of enterprises, high degree of vagueness of all factors of environment. Such a situation strengthens the competition between enterprises and stipulates the necessity of strategic planning of competition stability of the enterprise as an obligatory condition of survival of the enterprise and the achievement of the set strategic goals. The aim of the article is the development of a mechanism of forming and choosing the strategies of competition stability of an enterprise. In order to achieve the goal set out in the paper, the author’s definition of the category «strategy of the company’s competitive stability» was proposed based on the analysis of the definitions of «strategy» in the current economic literature. The role of strategic planning of competitive stability in the strategic planning system of the enterprise was determined, a classification of strategies for the company’s competitive stability was proposed. The theoretical, process-organizational and methodological foundations for forming and choosing the competition stability strategies of the enterprise were devised. The article uses methods of logical and semantic analysis, system and complex analysis, induction and deduction. The scientific novelty is in the author’s definition of the category «strategy of competition stability of the enterprise», the improved classification of strategies of competition stability of the enterprise, the developed mechanism for forming and choosing the strategies of competition stability of the enterprise. The results obtained in the article are universal and can be used in the process of strategic planning of competition stability of enterprises of any types of ownership and directions of activity. The development of methods for assessing and planning the enterprise’s competitive stability, the methodology for implementing the strategies of competitive stability, the decision-making mechanism regarding the strategy and tactics of competition should be considered as promising directions for further research.