The wind strike pattern of greater yang disease is an exterior vacuity pattern by general scholars in ”Shang-han lun”. Its chief prescription of treatment is using Cinnamon Twig Decoction. The wind strike pattern of greater yang disease was divided exterior and interior of defense aspect by Yi zong jin jian in the Qing Dynasty. The greater yang disease wind strike was initial stage at exterior of defense aspect. If body functions to anti-disease was insufficiency or inappropriate treatment. It will cause exterior pattern non resolved and that evil beat may be from microcirculation system of body surface invaded into tissue organ of viscera and causing inflammatory response. It's called the interior of defense aspect. So the content of greater yang wind strike pattern was not only exterior vacuity pattern of Cinnamon Twig Decoction, but also included interior pattern diseases of defense aspect which's pathomechanism, principle of treatment, and formulas were the essence of greater yang wind strike pattern. On the other band, it's also a classic sample in clinic treatment.