The exact location of this point is at the back of the knee, in the middle of the biceps femoris tendon and the semitendinosus tendon, i.e., the midpoint of the popliteal transverse stripe, and its effects are to clear heat, reduce swelling, and relieve pain. This point, also known as Blood Qie, is a conjunction point of the foot-sun bladder meridian and the lower conjunction point of the bladder, with the effect of clearing heat, subduing swelling, easing urgency and relieving pain. It is mainly used for the treatment of lumbar and dorsal pain, popliteal tendon contracture, impotence paralysis of the lower limbs, paralysis of the hemiplegia, abdominal pain, vomiting and diarrhea, sweating, addiction rash, dengtuinism, difficulty in urinating, and urinary loss and other disorders. This point is an important point for the treatment of acute and chronic lumbar and leg pain, and there is a saying in Chinese medicine that “the back of the waist and back committee in the search”, meaning that rubbing this point has the effect of relieving the pain of the back of the waist and back. At the same time can also be applied to this point with three-pronged needle puncture bloodletting therapy, commonly used in the treatment of acute skin diseases such as boils and venom, etc., but it should be noted that the method should be operated by a professional doctor, do not operate on their own.