The physiological function of meridians is closely related to the meridian circulation and Zang-Fu organs.Dai meridian that runs around the waist and abdomen, networks Zang-Fu organs in the waist and abdomen, and regulates the functions.Dai meridian circulates around the waist and abdomen, constraint meridians and collaterals.Since the waist and abdomen are the hinge of the body, Dai meridian plays a very important role in the Qi movement and motor functions of the human body.The functional connections and running route intersection of Dai meridian and others meridians provide the theoretical basis for their clinical application.In the circulation of the meridians Qi, Dai meridian can accumulate the whole body.Zang-Fu organs and meridians can also be involved with Dai meridian.In clinical practice, it is not only used to treat local pain and involved waist and leg pain, but also to assist the regulation of other meridians'Qi and blood functions, such as the transport function of spleen and stomach, the drainage function of liver and gallbladder, and the regulation function of Ren, Du and Chong meridians on growth and reproduction.Dai meridian can also be used to regulate the function of the vital Qi and the three-Jiao water channel.In clinical application, we can choose local treatment of Dai meridian, or the whole treatment of the functional connection between Dai meridian and other meridians.