Aesthetic ideas developed well in the Wei-Jin Period. Based on the "Shih-Shuo Xin-yu", this article deals with the concept of "beauty of nature" in order to clarify that intellectual attitude towards heaven, earth, and all that in between has changed a lot. First, this period regards no more that heaven is the supreme ruler, that heaven and earth are simple objective mechanics, and that natural happenings show mysterious omens. Secondly, intellectuals take natural objects, including animals and plants, to describe characters and talents of man. Thirdly, they view everything natural as aesthetic objects. By so doing, they may overlook the perilous political chaos and rigid ethical codes, and recover human life to a more healthy and balanced situation.