Astragalus has a variety of roles such as Yang tonifying qi, toxin detoxification (discharge of pus and poison in the body), non-toxic, high security, bone necrosis and long-term drinking astragalus bubble water is generally not related. Astragalus is warm, sweet, non-toxic, has the ability to produce fluid and nourish the blood, promote Yang to replenish qi, fix the surface to stop sweating (through consolidation of the muscle surface to stop sweating), diuresis to reduce swelling, to support the toxin to expel pus, convergence of sores to produce muscle (to help the sores to heal faster, to promote the growth of new flesh), and to move the stagnation of paralysis (to make paralyzed meridians open up) and other roles. Astragalus can be used to treat internal heat and thirst (internal fever accompanied by symptoms such as eating more, drinking more and urinating more), blood deficiency and atrophy, central qi subsidence (deficiency of spleen and stomach qi, appearing in the internal organs, such as the performance of the fall), qi deficiency and fatigue, surface deficiency and spontaneous sweating (due to the weakness of the surface of the muscle frequent natural sweating), deficiency of qi and oedema, loose stools with little food (thin and unshapely feces). As well as carbuncle (is a kind of poisonous sores, acute suppurative disease occurring on the body surface, limbs, internal organs) difficult to ulcerate or long ulcer does not converge, hemiplegia (one side of the limbs can not move freely), paralysis pain and numbness and other diseases. The adverse reactions and contraindications of astragalus are not clear, and there is no evidence that it has the side effect of causing bone necrosis, and astragalus is non-toxic, widely used in clinical practice, it is a higher safety of Chinese medicine. However, the efficacy of using astragalus in water is limited, and the active ingredients are difficult to be analyzed, making it difficult to achieve a good therapeutic effect. It is recommended to use Chinese medicine under the guidance of a professional doctor. It is recommended that people with bone necrosis should consult a professional doctor in a timely manner to standardize the treatment and not to delay the condition.