Onion Jiang Shui can smoke the house. According to relevant data, onion Jiang Shui can fumigate the room, which is beneficial to air circulation, but it cannot directly kill the virus and prevent virus infection. Boiling water with ginger, onion and garlic has the effects of sweating, relieving exterior syndrome and resisting virus, while boiling water with onion, ginger and garlic has the effects of sweating, relieving exterior syndrome and stopping vomiting. Can be used for treating common cold and cough caused by exogenous wind-cold.