Modern people use latitude and longitude to locate every location on the planet, from landmarks like the Forbidden City and the Eiffel Tower to your home and business. The idea is that each location corresponds to only one set of numbers. We often marvel at the wonders of modern information technology. In fact, Chinese medicine also has a positioning system. No matter what physical symptoms, psychological discomfort, no matter which organ, which part of the problem, we can retrieve this positioning system, find the idea and way to eliminate the disease. This positioning system is the meridian system proposed in the Huangdi Neijing. The twelve channels and collaterals system in Huangdi Neijing can be regarded as a very primitive medical positioning system, and also the most advanced positioning system. It's primitive because it was discovered by ancient people in a way that we don't know about anymore. Some Qigong practitioners believe that ancient sages and famous doctors studied the laws of nature through retreats, which are called "inner view".

Li Shizhen, a famous medical scientist in the Ming Dynasty, has a famous saying that seems to illustrate this point. He pointed out in the book "Strange Classics Eight pulse Examination" : "The interior tunnel, only the viewer can observe it." It means: the scene inside the viscera is like a tunnel. We can only see it if we practice certain skills and have the special ability of inner vision. Although few people can find meridians in this way, it is surprising to find that many empirical studies can prove their existence. That's what makes it so advanced. The core position of meridian system in the theory and practice of traditional Chinese medicine. "Plain ask" proposes: "evil guests in the skin is striae, open evil guests in the veins, veins full of notes in the meridians, meridians full in the viscera also." This indicates the process and mechanism of disease occurrence and development. Skin, collaterals, channels, fu organs and viscera represent the conduction levels of pathogenic invasion, and meridians are the mediations of exogenous pathogenic conduction and recovery of health. Where are the specific locations of meridians? "Lingshu · Meridians" said: "The twelve meridians, between the meat of the Fu line, deep and invisible. These are the meridians. The expression of the vein is "all the veins floating and common, all the veins are also". In the language of modern Chinese medicine, "Jingluo" is the general name of meridians and veins. Meridians are the longitudinal trunk of meridians and collaterals system. The veins are branches of the meridians that spread throughout the body like a network. Meridians are the channels through which qi and blood flow. Meridian is a kind of organization system that runs qi and blood, connects inside and outside, and regulates the whole activity of life. Meridians belong to Zang-fu organs, outside the limbs, crisscross the network of the whole body, from which the human body's Qi and blood can run.