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The correct choice of criteria of objective estimation of success of introduction – the one of relevant questions in introduction investigations. The results of estimations with the use of existing, at present, methodologies in which a preference gives to the criteria of stability, are indicative of very high degree of success of introduction for most species. However comparison of vital factors of introducents in natural habitats and in the areas of introduction, not always confirms these estimations. The height of plants as well as maximum age within the areal, often are bigger than in the area of introduction, although introducent tolerates well the climatic terms of these area. This fact put in a question reasonability of choice as a criterion of estimation of success of introduction of stability of introducents and it is required, undoubtedly, the deeper analysis of expediency of the use for this purpose one or another figures. In the article, from position of systemic approach and theory of adaptive strategy of plants it is founded, that the objective final estimation of success of introduction it is possible only by using as criteria of output parameters of the system plant–environment (figures of the vegetative and seminal productivity, maximum age and other endpoint of vital functions of plant). The main argument of pointlessness, using of any form of stability as a criterion of final estimation is ambiguousness and unforeseeable of its display as a consequence of direct dependence on duration and intensity of influence by negative factors of environments that constantly and not always change by forecasting. To obtain the comparable estimations for the plants of different systematic belonging or plants within same species in different regions the evaluation parameters received from introduction area must be expressed in relative figures, and correlated with parameters in a natural habitat.