The number of child in patients with bronchial foreign bodies is monthly periodic, with 12 months as a cycle, and respectively reaching the peak in November and December, and the valley in June and July; the seasonal characteristic was apparently related to the monthly characteristic, with the numbers of inpatients in autumn and winter each year being significantly higher than in the spring and summer, and the incidence showing apparent seasonal correlation. The results allow for the proposal of relevant precautionary measures against bronchial foreign bodies in children.