Health preservation of Chinese studies mainly draws wisdom from Chinese classics, guides our life, and obtains high-quality life and living conditions through internal training and external training. This includes the truth of the ups and downs of yin and yang learned from the Book of Changes, so as to reveal some objective laws of nature and human society and guide people how to adapt and use the laws of nature to practice and live. At the same time, Yi Zhuan studies people's essence, qi, spirit and heart from the perspective of yin and yang and five elements, and holds that "sex" (spirit) is the essence of life, and it is an innate opportunity in health preservation and is in a dominant position; "Life" (form, that is, body) is the origin of life and belongs to physiological function from the perspective of health preservation. "Sex" and "destiny" are inseparable. Without sex, life is at a loss, without life, sex is at a loss.