The subject of this paper is fundamental conception and theory of nature. This paper tries to throw new light on the themes of natural experience in itself, its logical structure and law, its principle and prerequisite, as well as the contradiction of natural experience in itself. In general the conception of nature in science which is regarded irrelevant to subjective meaning has not origin of logic and can not stand firm. In the terms of unity of subject and object, this paper tries to interpret the meaning of fundamental natural conceptions logically, set up the corner stone of scientific buildings. The theory of natural philosophy is a mega-theory of green building and eco-homeland.