Introduction: Acute bronchiolitis is the most common lower respiratory infection in children. It is particularly prone to dyspnea among children under two years old. Inhaled hypertonic saline (HS) has recently been shown to be a favorable therapy, because of its facility to draw fluid from the submucosa and adventitial spaces, decreasing airway edema. The aim of this systematic review and meta-analysis was to evaluate the efficacy and safety of HS in the implementation of vapor treatment among children with bronchiolitis.Methods: A systematic literature search was conducted using Cochrane Library, PubMed, EMBASE and Airiti Library (Chinese Database) for randomized controlled trials from inception to July 2019. We calculated pooled risk ratios (RR), mean difference (MD) and 95% CI using RevMan 5.3 for meta-analysis.Results: In total, 4186 children from 32 publications were included. Compared to the control group, the HS group exhibited significantly reducing the level of severity of respiratory distress, included studies used the Clinical Severity Score (95% CI −1.15, −0.27, I² = 73%) and Respiratory Distress Assessment Instrument (95% CI −0.95, −0.26, I²= 0%) for evaluation respectively. Further, the HS group decreased the length of hospital stay 0.54 days (95% CI −0.86, −0.32, I²= 81%). Conclusion: We conclude that nebulized with 3% saline solution is effective in decreasing the length of hospital stay and the severity of symptoms as compared with 0.9% saline solution among children with acute bronchiolitis. Further rigor randomize controlled trails with large sample size are needed.