High flow nasal cannula（HFNC）is a novel oxygen therapy developed in recent years，and has been successfully used in pediatric diseases such as bronchiolitis and pneumonia.Although there has been a lack of clinical application guidelines in pediatrics，it has been increasingly applied to the treatment of exacerbations of bronchial asthma.This review focused on efficacy，application timing，complications and parameters adjustment of HFNC in children with asthma exacerbation，so as to further guide the clinical use.
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