Abstract: The speculation of human being's existing civilization becomes an urgent affair because of the present global zoology crisis.Restudying the ecological economics thoughts of Confucianism in Pre-Qin Dynasty can help forming a more comprehensive understanding.The conclusions of the speculation are as follows: there are three solid foundations in the ecological economics thoughts of Pre-Qin Dynasty's Confucianism,that is,the concept of "combination of human and nature",the logical train of "a learning both sound in theory and practice and considering others in one's own place" and the religious culture of "reverence toward nature";with the joint force of these three solid foundations,sustainable development is regarded as the notable feature of Confucianism's economics thoughts,especially in the fields of production,consumption,taxation and distribution,which provides profound enlightenment for us who are getting trapped in ecological dilemma.