The relationship between the liver and the kidney is that essence and blood are of the same origin, and that they are mutually utilized for hiding and draining, and that yin and yang are mutually nourishing and mutually restraining. The same source of essence and blood refers to the liver to store blood, the kidney to store essence, essence and blood from the same source of water and grain essence, and can be transformed into each other’s capital. Liver blood deficiency and kidney essence deficiency affect each other, resulting in dizziness, deafness and tinnitus, lumbar and knee pain and weakness of the liver and kidney deficiency. Hiding and draining are mutually utilized, meaning that the liver is responsible for draining and the kidney is responsible for sealing and storing, and there exists a relationship of mutual constraints and mutual utilization between the two. Drainage and sealing are opposite to each other, thus regulating ovulation and menstruation in women and spermatogenesis in men. If they are out of balance, women may experience menstrual disorders, heavy menstrual flow or amenorrhea, as well as ovulation disorders. In men, impotence, spermatorrhea, and spermatorrhea can be seen. Yin and yang nourish each other and control each other, meaning that kidney yin is the root of all yin, abundant kidney yin nourishes liver yin, and sufficient liver yin can replenish kidney yin. An abundance of liver and kidney yin can prevent excessive liver yang and maintain a harmonious balance between liver and kidney yin and yang. Kidney yang subsidizes liver yang, warms the liver veins, and prevents cold and stagnation of the liver veins.