Abstract: To compare the clinical effects of warmed humidified oxygen atomization with oxygen atomization at room temperature on children with capillary bronchitis. Method Total 120 children with capillary bronchitis were divided into control group (60 cases) and experiment group (60 cases) randomly. The children in experiment group adopted warmed humidified oxygen atomization, while the children in control group adopted oxygen atomization at room temperature. The inhalation drugs were Ventolin, Atrovent and Budesonide, the main symptoms, cough reaction, sputum characters and hospitalized time were compared before and after treatment. Results The time for recovery back to normal temperature, asthma relief time, the disappearing time of cough, wheeze and moist rale, cough reaction, hospitalized time of control group were significantly shorter than those of observation group (P<0.01). The expectoration increased (P<0.01), and thinner than control group (P<0.05).The rate of clinical cure was higher than control group (P<0.05). Conclusion Warmed humidified oxygen atomization plays more effective role in significantly easing the symptoms and signs，improving the viscosity of sputum, reducing adverse reactions and shortening the hospital stay, and has obvious advantages comparing with room temperature oxygen atomization.