Arteriosclerosis occlusion of the leg is related to the disease of Chinese medicine: gangrene (at first cold and numbness of the limb, then necrosis of the toe joints, black rot and ulceration, which will not be healed for a long time). The common types of gangrene are: cold and dampness blocking the collaterals, blood stasis, dampness and heat toxicity, heat toxicity injuring the yin, and qi and yin both injuring the five types of evidence. 1. Cold and dampness obstructing the collaterals: the treatment is warming Yang and dispersing cold (warming Yang Qi and dispersing cold), activating blood and opening collaterals. Commonly used formula: Yanghe Tang. 2. Blood stasis and obstruction: treating by activating blood circulation and removing blood stasis (promoting blood circulation and eliminating blood stasis in the body), clearing channels and relieving pain (dredging channels and collaterals to relieve pain). Commonly used formula: Tao Hong Si Wu Tang. 3. Excessive Dampness-Heat-Toxicity: to activate Blood circulation, remove Blood stasis, clear Heat and relieve Dampness (to remove Heat and Dampness from the body). Commonly used formula: Si Miao Yong An Tang. 4. Heat-poison injury to yin: clearing heat and removing toxins (removing heat-poison evil from the body), nourishing yin and activating blood. Commonly used formula: Gu Bu Tang. 5. Injury to qi and yin: the treatment is to benefit qi and nourish yin (tonifying qi and nourishing yin). Commonly used formula: Astragalus and turtle shell soup. Drugs should be used under the diagnosis and treatment of professional Chinese medicine practitioners to avoid the adverse effects caused by blind self-medication.