Mingmen point is a major point for human longevity. The functions of Mingmen include kidney yin and kidney yang. Modern medical research shows that the fire of life gate is the yang of human body. Clinically, the disease of fire failure of life gate is mostly consistent with kidney-yang deficiency syndrome. Most of Bumingmen's medicine forks have the function of tonifying kidney and strengthening yang. Rubbing Mingmen point regularly can tonify kidney, warm kidney, strengthen yang, strengthen waist and knees and delay human aging. Clear the stagnation point of qi on Du meridian, strengthen the connection with Ren meridian, and promote the movement of true qi on Ren meridian. It can also be used to treat impotence, nocturnal emission, strong spine, lumbago, kidney cold and yang failure, walking weakness, limb weakness, leg edema, ear diseases, etc. There are two ways to exercise at Mingmen. One is to rub Mingmen point and two kidneys with the palm of your hand to feel the heat, and then rub the two kidneys with your palm to keep your mind on Mingmen point for about 10 minute. The second is the method of selecting yang and eliminating yin: the method is that the back is facing the sun, and the light, energy and heat of the sun keep entering Mingmen point, and the mind must be injected into Mingmen point for about 15 minutes.