Based on "pre-asthma lesions" to explore the efficacy evaluation of The NO.1 XiaoQian Prescription in the prevention and treatment of children with

INTERVENTION: The western medicine group:Montelukast ;Chinese traditional medicine group:xiao Qian Formula 1; CONDITION: wheeze; childhood asthma PRIMARY OUTCOME: Number and frequency of wheezing attacks;Incidence of children asthma; SECONDARY OUTCOME: Unable to go out for normal hours due to illness;Pulmonary function test;The emergency number;Blood Biochemistry;Hospitalization days;The daily cost;TRACK table;The number of times you hold in at night;ECG;Routine blood;FeNO;Number of emergency drug use;Number of activity restrictions; INCLUSION CRITERIA: (1) Children aged 3‐5 years; (2) Children with past symptoms of wheezing and mAPI positive; (3) The guardian can cooperate with the medical records, complete the scale and agree to participate in the study; (4) Those who had used glucocorticoids, leukotriene receptor antagonists and Traditional Chinese medicine should stop taking drugs for one month before participating in this study.