Tianjue is a kind of essence substance that can promote human growth, development and reproduction when the kidney essence and kidney qi are full to a certain degree, which originates from the kidney qi, and gradually tends to mature with the nourishment of water and grain essence from the later days, and then it will be exhausted with the weakening of the kidney qi. For women, Tian Kuei can make the essence, blood and fluid of the Ren Vessel flourish, abundant, and accessible, so that the Chong Vessel can widely gather the blood of the internal organs under its action, and the Chong Ren Vessel will be full, the sea of blood will be overflowing, and menstruation will come. It is a kind of Yin essence that affects human growth, development and reproduction, and is a kind of essence substance that can regulate human endocrine secretion.