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Being a thought of Chinese ancient naive materialism and spontaneous dialectics, the theory of Yin－Yang and Five Elements believed that world was material,and the material world was multiplied and developed by Yin－Yang, called QI, and wood, fire,earth,metal and water, five basic matters formed world were indispensable elements．The five kinds of matters were interdependent and counterbalance each other, situated in continuous movement and change． The theory showed some profound influence on ancient materialistic philosophy later, for example：ancient astronomy meteorology chemistry mathematics, medicine and music, developed by its assistance．

The theory of Yin-Yang and Five Elements was applied to medical domain extensively to explain origin of mankind, physiological phenomenon, pathological change and to guide clinical diagnosis， prevention and treatment became an important part in Chinese medicinal theory and gave some deep influence at emerging and developing Chinese medicinal science．

(1)The theory of Yin-Yang the theory of Yin-Yang believes that world is a material whole. There are both aspects, Yin and Yang， in every things of world, which are antagonism and unity each other, being acardinal principle of coming into being， developing， and passing away in nature． As《SuWen·Yin-Yang Ying Xiang Da Lun》said "Yin and Yang are doctrines of heaven and earth�,guiding principle of everything， parents of variation， foundation of life and death” So the motion law of contradictory of opposite and unity of Yin－Yang is an inherent law for everything's changes in nature, and world itself is a movement result of opposite and unity of Yin－Yang．two kinds of Qi．

Yin-Yang is a condensation about two sides of thing and phenomenon with opposite and interrelates not only in nature ,but also in objects.So that Yin-Yang have university ,opposite and divisible .

1. University of Yin-Yang D

2. Divisible of Yin-Yang

3. Opposite of Yin-Yang

4. Inter-antagonism of Yin-Yang

5. Inter-rooting and inter-utilization of Yin-Yang

6. Inter-counterbalance of Yin-Yang

7. Inter-convertibility of Yin-Yang

(2)The theory of Five Elements

The theory of Five Elements also belongs to the thought of Chinese ancient materialists dialectics. Ancient philosopher believes that nature consist of five basic elements: wood ,fire ,earth ,metal and water ,which are interdependent and counterbalance each other in a situation of continuous movement and change ,called Five Elements . they think that the development and change of every thing and phenomenon are results of evolution and interaction of Five Elements in universe .According that they condensat and explain the whole material world by abstracting and reasoning different attribute of anti-Five Elements step by step .The theory of Five Elements is used to explain the changes of physiology and pathology human body and relationship between human being and external environment ,guided clinical diagnosis and treatment in Chinese medicine

1. Attribute and classify of Five Elements

2. Generation ,restriction ,subjugation and reverse restriction of FIVE elements

(3)The relationship between Yin-Yang and Five Elements

The theory of Yin-Yang mainly explain the relationship of interdependent ,inter-growth and decline, and inter-transform between opposite both sides in things ; but the theory of Five Elements explain property and interrelation in things by classify of Five Elements and law of generation ,restriction ,subjugation and reverse restriction in property of things .In Chinese medicine both of them consider that the material bases of them are and viscera ,meridian ,Qi .blood and fluid ;both of them analyze study and explain physiological activity of human body ,pathological change and various reference in and out of body guides clinical pattern identification and treatment from macroscopically natural phenomenon including the law of human body ‘s change in analogy.

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