Abstract:Environmental philosophy has now encountered the challenge of discipline attribution uncertainty in its development,which is essentially a resultof self-lost of It.Environmental philosophy as a standard philosophy is determined by the task of philosophy.The task of philosophy indicates thatenvironmental philosophy should provide us with a perfect value evaluation system and principles to deal with the fundamental issue of human-nature relations,and it is also the basic way in which it participates in social action.The emergence of environmental philosophy is not to add an ordinary subdisciplinein philosophy,but instead it is a fundamental evaluative philosophy that appears in philosophy and plays an irreplaceable and central role in dealingwith the relationship of human to nature,filling the gap of the serious lack of philosophy in this respect.The emergence of environmental philosophyhasopened up a historical prelude that it is as the evaluative philosophy and its social practice.

Key words:EnvironmentalPhilosophy;Human andNature;Task ofPhilosophy;CognitiveCertainty;ActionalCertainty