Panax quinquefolium is the dried root of the woad plant of the family Cruciferae, which is a Chinese herbal medicine. Its main pharmacological effects are as follows: i. Anti-pathogenic microbial effects, the purgative and detoxifying effects of woad are mainly reflected in the treatment of acute infectious diseases; ii. Anti-endotoxic effects, endotoxin has an ordinary influence in the pathogenesis and development of acute infectious diseases, several scholars have conducted in-depth studies on the anti-endotoxic effects of woad and found that woad can significantly reduce endotoxic DIC, accelerate serum LPO level, improve SOD activity, thus liberating the biological effect of endotoxin; Third, antipyretic effect, fever is the main symptom of warm fever, according to research woad can reduce the elevated body temperature caused by typhoid fever, paratyphoid fever, etc., with strong antipyretic effect; Fourth, anti-inflammatory effect, in the clinical Panax notoginseng is mainly used for the treatment of exogenous fever, warm disease at the beginning, sore throat, warm spot, dangue, carbuncle, sore. However, there is no evidence to prove that Banlangen can prevent viral pneumonia.