The article is sanctified to the questions of estimation so-called possible loading on an ecosystem. It is marked that the basic criteria of the ecological setting of nof the anthropogenic affecting ecosystems of South Приаралья. The ecological setting of norms supposes the account of the orms it is been: maintenance of biotic balance, stability and variety of ecosystem. The basic mechanism of influence of the anthropogenic affecting ecosystems consists in their mediated influence on an ecological capacity and structured of environment.