The scientific community regards the health-sustaining environment as a cornerstone of modern and future school education. Health is the basic criterion, a sort of "social barometer", demonstrating the value of a human's life for the society. Health-sustaining educational technologies, aimed at formation of positive attitude to the education, help to facilitate the learning process. The proposed article examines organisational, methodological and technological foundations underlying the formation of the health-sustaining environment of an educational institution. The key elements are the following: provision of educational process participants with health-sustaining value orientations; health-sustaining activity and health-sustaining educational technologies aimed at study facilitation and academic overloads removal, which will help to preserve schoolchildren's health, their physical, mental, moral and social well-being. In a modern educational institution, children's health should be preserved and improved by a special service; the experimental work of one of this is represented by the researchers. In the conclusion, the authors propose an operational definition of health-sustaining environment and a possible variant of its formation. (C) 2017 Published by Future Academy www.FutureAcademy.org.UK