The theory of the meridians and the theory of the essence-qi-spirit are the basis to explore and study the science of qigong.

The thesis is based upon Chapters Five and Six of '21st Century: A Way for Human Health and Longevity,' the basic theories of traditional Chinese medicine and qigong. During the practice of 'Nei Dan Gong' (Internal Pellet Exercise) to train the essence-qi-spirit, the objective existence of the eight extraordinary meridians, the secondary meridian system of the human body is found with the condition and regulation of the 'meridian qi' circulation in the Conception Vessel, Governor Vessel, Flush Vessel and Belt Vessel. Furthermore, the existence of the 'new triple energizer meridian', the third meridian system of the human body, is found with the activity regulation of the 'meridian qi circulation in the upper, middle and lower energizer of the human body in circles. 'A Study on Eight Extraordinary Meridians' written by Li Shizhen, the famous herbalist and great qigong practitioner in the Ming Dynasty also proves the existence of the eight extraordinary meridians, and the physiological functions and features of the eight extraordinary meridians, especially the Conception Vessel and Governor Vessel. During the practice of the traditional 'Nei Dan Gong' (Internal Pellet Exercise),we have found the relationship of the Zhen-Real Qi (the Ying-Nutrient Qi and Wei-Defensive Qi),Qi of Dantian (Pellet Field),Yuan-Primary Qi of triple energizer, Dong-Moving Qi between the kidneys and 'kidney qi±. The practice of the traditional 'Nei Dan Gong'(Internal Pellet Exercise) dredges the Conception Vessel and Governor Vessel, so the 'meridian qi 'circulates in the 'Small Heavenly Circle'. It dredges the Belt Vessel, so the 'meridian qi ±circulates in the large Heavenly Circle.” This type of practice shows the sign that the 'kidney qi' has already been strengthened and enriched inside the human body. The practice of the traditional 'Nei Dan Gong'(Internal Pellet Exercise) may train the Yuan-Primary Essence, Yuan-Primary Qi and Yuan-Primary Spirit of the human body. We have further found that the autonomic nerve system controlled by the hypothalamus and the neuroendocrine regulating system controlled by the 'hypophysis - adrenal gland - gonad' axis are involved in the series of activities. It shows that there is a close relation between the essence-qi-spirit (the Yuan-Primary Essence - the reproductive essence of man and women, the Yuan-Primary Qi - the kidney qi, and the Yuan-Primary Essence - the Mud Pill Palace or the right brain) and 'hypophysis - adrenal gland - gonad' axis of the human body. It also shows that there is a close relation between the qigong(the traditional' Nei Dan Gong'(Internal Pellet Exercise and the modern science and human science. It further proves that the meridians and essence-qi-spirit of the human body are the key content and direction to explore and study the relationship between the qigong and human science.