According to "Four Images" theory on "Nature and Human Being Unite as One", this thesis comprehensively and systematically elaborates the aesthetic characteristics of Huai-nan Tzu.

Through an analysis to the "four images and three circles", a new perspective and a new way of thinking may be provided for the studies of ancient Chinese aesthetics and arts.

The five-element numbers of Hetu should not be confused with the four-image numbers of Zhouyi.

The "four images and three circles" is actually a generalization of the ancient Chinese aesthetics with primal culture as its context.

Based on the specifics and difference of Sa-Sang Constitutional Medicine, it has brought forward the peculiarity in diagnosis and treatment for hypertension.