Astragalus membranaceus: sweet in taste and warm in nature. Enter the lung and spleen meridians. Efficacy: invigorating qi and yang, strengthening exterior and stopping sweating, inducing diuresis to reduce swelling, supporting sores and promoting granulation. Chemical composition: contains astragaloside, soyasaponin, various glucosides, formononetin, carotin, lupeol, β-sitosterol, coumarin, polysaccharide and more than 20 kinds of amino acids, especially asparagine, concanavaline, proline, arginine and y- aminobutyric acid. It also contains about 20 kinds of trace elements, among which calcium, phosphorus, magnesium and iron are relatively high. Pharmacological effects: 1, can significantly improve the body's nonspecific immunity, humoral immunity and cellular immunity, increase the activity of natural killer cells, promote the induction of interferon, reduce the activity of erythrocyte immune adhesion inhibitor, increase the activity of enhancer, and improve the ability of C3b receptor on the surface of red blood cells to remove pathogenic circulating immune complex. The function of enhancing immunity is comparable to that of gamma placental globulin. 2. It has anti-aging effect, can prevent senile arteriosclerosis, improve lung function and increase the activity of superoxide dismutase; It has two-way regulation effect on blood sugar, but has no obvious effect on insulin hypoglycemia. Astragalus mongholicus has the effect of scavenging free radicals. 3. It can increase red blood cells and hemoglobin of anemia patients, promote the recovery of white blood cells and thrombocytopenia patients, and has the function of improving or restoring red blood cells; It has protective effect on myocardial cells, reduces the degree of injury and obviously improves the cardiac function of patients with viral myocarditis. 4. It has certain antiviral effect. Although it can't inactivate many viruses directly, it can inhibit their pathogenic effect and virus self-replication. 5, it has a certain anti-cancer effect. It can reduce the incidence of cancer, prolong the survival period and accelerate the death of tumor cells in human body. 6, diuretic effect, can reduce the amount of urine protein, reduce kidney disease. It can enhance memory function, inhibit gastric juice secretion, reduce gastric acid and resist ulcer.