Objective To observe the effect of intermittent inhalation of budesonide on lung function and recurrence in asthmatic infants. Methods 120 children with recurrent wheezing and asthma predictive index were selected.They were randomly divided into control group and observation group according to the digital table, 60 cases in each group.The two groups were given conventional treatment.The observation group was treated with high dose of inhaled budesonide in the acute phase for 7 days, and stopped after the symptoms were controlled.However, cold air or acute infection caused wheezing recurrence, used the above dose for 7 days to control the wheezing symptoms, if not properly controlled to extend the treatment time so that wheezing control.In the control group, children were treated with foggy cans inhalation of fluticasone propionate aerosol.After the symptoms were controlled, the dose was reduced for 3 months.If the cold air or the occurrence of acute wheezing, should be treated in time.The time of disappearance of wheeze in the lungs of the two groups was observed.The changes of lung function were observed before and after treatment for 6 months.The number of recurrent respiratory tract infections was observed in the two groups during this period. Results The disappearance time of wheeze, cough, wheezing rale between the two groups had no statistically significant differences(t=0.67, P=0.25; t=0.96, P=0.17; t=1.60, P=0.06). Before treatment, the lung function indicators between the two groups had no statistically significant differences(all P>0.05). After treatment, TV, VPFE/VE, TPTEF/TE of the two groups were improved (all P 0.05). The number of respiratory infections, the number of wheezing and the duration of wheezing in the observation group were less than those in the control group (t=14.72, P=0.00; t=9.15, P=0.00; t=6.97, P=0.00). There were 5 cases of hoarseness and 4 cases of rash in the control group.There were no serious adverse reactions in the observation group, the difference was statistically significant (χ2=9.73, P=0.002). Conclusion Intermittent inhalation of budesonide suspension can improve the clinical symptoms and improve lung function in children.It is better than long-term inhaled glucocorticoid in prevention of wheezing and with safety.It is suitable for clinical use. Key words: Budesonide; Asthma; Recurrent; Respiratory function tests; Infant