Abstract: The yin and yang that began in ancient times,the Western Han down are thinking of a long cultural history to occupy the position of the ruling.Theory of yin and yang constitute the traditional culture of the most general theoretical framework.It meets the ancient understanding of nature,society and life,and social needs,reflecting the overall picture of people＇s nature and laws of a comprehensive understanding of the world outlook and methodology is the ancestors of the foundation.Yin was originally two different theories,to the Warring States period,and gradually blend,used to explain all the natural and social phenomena.