Severe lung infection should be preferred to broad-spectrum powerful antibacterial drugs, give oxygen and other symptomatic supportive treatment as appropriate. 1. Broad-spectrum potent antibacterial drugs: broad-spectrum potent antibacterial drugs are preferred for severe pneumonia, and combined with adequate dosage, such as penicillin combined with azithromycin, moxifloxacin combined with amitrazine, ceftriaxone combined with levofloxacin and other treatments. Generally, the medication can be stopped 2 to 3 days after the fever subsides and the clinical symptoms are relieved. 2. Symptomatic supportive treatment: for patients with significantly reduced oxygen saturation, mask oxygen or non-invasive ventilator-assisted ventilation can be used; for patients with persistent high fever over 38.5℃, non-steroidal anti-inflammatory drugs such as ibuprofen, indomethacin and other treatments can be given in moderation; when there is too much sputum, expectorant drugs such as aminobromine hydrochloride and acetylcysteine can be used for treatment. The above drugs should be applied in a standardized and reasonable manner under the guidance of professional physicians and pharmacists. If the symptoms fail to improve or even worsen gradually, it is necessary to consult a regular hospital in time, and cooperate with the doctor to improve the examination and standardized treatment.