In spite of a growing frequency of using the notion sustainability, no exact and univocal definition of this notion, and mainly its contents exists, as yet. The concept of sustainability seems to be very often used in the meaning and/or interpretation, of stability (in the sense of the dynamic equilibrium, or homeostasis). To distinguish these two notions and to search for both differences and causal relationships not only between these two notions, but also between them and another relevant notion – productivity – is the main aim of this contribution. Regarding the relation between productivity, stability (as a dynamic equilibrium or homeostasis) and sustainability of eco(geo)systems we can conclude, that eco(geo)systems become sustainable when they are simultaneously capable of sufficient self-regulation, i.e. if they are sufficiently stable and on the other hand, eco(geo)systems remarkable for a high degree of stability (homeostasis) are simultaneously able to fulfil also the production functions at a required rate. For the practical application of the concept of sustainability there are, put in a very simplified way, two basic logical salient points: 1. to increase productivity of stable eco(geo)systems within the limits of ecological (landscape-ecological) carrying capacity, 2. to increase the stability (homeostasis) of the productive systems within the limits of economic acceptability until the restauration of their self-regulation abilities. We can conclude, that the aim of sustainability concept implementation should be searching for a balanced relationship between phenomena of the productivity and the stability (homeostasis) and to save productive and reproductive capabilities of eco(geo)systems. At the same time we can apply this approach in the field of designing territorial systems of ecological stability.