All health-preserving people should be based on healthy qi. The root cause of human diseases and premature aging lies in the deficiency of "righteousness" in the human body. Traditional Chinese medicine believes that "Qi" is a subtle substance that operates organs such as viscera and meridians, which can promote and warm human life and is the source of life. Those who are full of healthy qi can maintain the balance of yin and yang, thus improving the four functions of the human body: immunity, defense, regulation and metabolism. Therefore, "nourishing healthy qi" is the fundamental rule to prolong life and preserve health. The "Four Health-preserving Moxibustion Methods" achieve the functions of warming spleen and kidney, tonifying kidney qi and promoting spleen and stomach transport by moxibustion at four health-preserving points of human body-Guanyuan point, Mingmen point, Zhongwan point and Zusanli point, so that healthy qi can naturally flow and kidney water can naturally fill. Earth, water and air can grow everything, nourish the internal organs and limbs, and people will naturally live a long and healthy life.