These 3 points are the regulatory of "Khi", for treating specifically all diseases of "Khi". Khi Hai is the reservoir of "Khi" ("Air") which originates the "Khi" of all body, the dynamic "Khi" below the navel and the departure of original "Khi". Dan Trung is located in the middle of two lungs. Just the lungs manage the body in whole, they consume the out air and regulate the "Khi" extracted from the digestion of food supplied by the gastrointestinal artery. Trung Quan is the coincide points of all organs, making the pure "Khi" circulated upwards and the opaque "Khi" downwards. From there central "Khi" regulate the whole for creating the complete store of "Khi"