The article analyses external and internal factors of the market environment, which influence formation of the enterprise labour potential. It offers supplement the existing classification properties with the following ones: international, political-legal and natural-climate factors. It shows that, in the result of the balanced reaction on the international level of influence of factors of formation of labour potential, it is possible to sharply accelerate development of the labour potential by means of realisation of programmes of international education, legal regulation of migration, active participation in various inter-state projects, etc. Influence of political-legal factors of formation of the labour potential shows up in inter-state agreements on labour migration regulation, in application of the system of uniform branch tariff-qualification reference books and in establishment of the system of licensing individual types of activity. Natural-climate conditions exert significant influence upon the level of labour potential. This influence shows up: in different life expectancies, sickness rate, labour life duration, etc. for various natural-climate zones. The article classifies the factors of labour potential with respect to the enterprise also both by exogenous and endogenous groups.