To interpret the thought of Chan Sect from the perspective of ecology,it should make certain that Chan Sect concerns about moksa instead of ecological environment.To make Chan Sect interact with each other,it is necessary to focus on one the point:all the issues concerned are related with man’s suffering.Onthis point,Moksa pursued by Chan Sect is connected with nature cared by ecological philosophy.The study of the core category of heartlessness of Chan Sect from the perspective of ecology and the research into the meaning of the propositions of heartlessness with Buddha nature and heartlessness showing truth indicate that it is possible to realize equality based on nonexistence.Then the questioning on Pantheism and the act of killing animals are shown.The meaning revealed by Chan Sect through the category of heartlessness and its propositions and the image of heartlessness is the same:equality through non-existence.Therefore,it is necessary for ecological philosophy to learn from the idea of non-existence equality advocated by Chan Sect to realized man-nature harmony.Also,it is important to let the religious feature of Chan Sect alone.Hence,it is possible to begin with understanding man’s problem and nature’s problem in a equal way to realize mannature harmony.