Flu infusion is mainly to promote faster and better healing of the cold and prevent the formation of the corresponding complications. Patients with common viral colds generally do not need infusion therapy, by asking patients to pay attention to rest, drink more warm water, if necessary, take some oral cold medicine, for flu patients can also take oral oseltamivir capsules to strengthen the support of treatment, patient symptoms can be more quickly relieved. Patients with severe colds, especially those with gastrointestinal colds, who have obvious nausea, vomiting, diarrhea and profuse sweating, need to be treated with intravenous rehydration to maintain their water-electrolyte balance and prevent the formation of corresponding complications. Patients with viral colds can develop bacterial infections, and if oral antibiotic treatment is ineffective, they can be treated with intravenous antibiotics to promote the relief of bacterial colds as soon as possible, and sometimes they can be given intravenous Chinese medicine to clear the heat and detoxify the toxins to relieve the clinical symptoms of patients. Therefore, the need for infusion treatment depends on the severity of the patient’s condition and the related complications.