Ginger and onion water has the effect of relieving wind-cold and flu, but because of the limited efficacy of using the infusion, it is not a substitute for medication to treat the disease. Ginger is the fresh rhizome of ginger, family Zingiberaceae. It is pungent and slightly warm in nature, and belongs to the lung, spleen and stomach meridians. It has the effects of relieving cold (removing cold from the surface of the muscles), warming the stomach and stopping vomiting (treating vomiting caused by stomach cold by warming the spleen and stomach), resolving phlegm and relieving cough, and detoxifying fish and crabs. Clinically, it can be used in the treatment of wind-cold cold, stomach cold and vomiting, cold phlegm and cough, fish and crab poisoning and other diseases. Ginger and green onion in water has a certain role in relieving cold, wind-cold cold has a certain effect on relief, but the efficacy of the use of water is limited, can not replace the drug treatment. Patients with colds are advised to go to regular hospitals and be treated under the guidance of professional physicians.