Objective To investigate distribution rules of traditional Chinese medicine（ TCM） constitution pattern in children of different ages with bronchial asthma. Methods Three hundred children were randomly selected from 874 children with bronchial asthma at clinical remission stage or non acute attack stage. The selected child patients were divided into three age groups: 8 months to 3 years

3 + years to 6 years

and 6 + to 12 years.Their TCM constitution was judged with questionnaire investigation. The combined condition of constitution and acute onset factors of asthma

as well as the constitution rules were analyzed. Results In 300 children with bronchial asthma

there were 67. 33% with Qi obstruction constitution

27. 33% with Yang deficiency constitution

and 5. 33%with Yin deficiency constitution. Most of the patients were with combined constitution. Among them Yang deficiency and Qi deficiency constitution combined with phlegm and dampness constitution and specific endowment constitution were common in children of 8 months to 3 years old; Qi deficiency with phlegm and dampness constitution

and specific endowment constitution were common in children of 3 + years to 6 years old; Qi deficiency with phlegm and dampness constitution

dampness and heat constitution

and specific endowment constitution were common in children of 6 + to 12 years old. It was also found that the acute onset factors were different in children of different ages with bronchial asthma. Conclusion Qi deficiency constitution is more common in children with bronchial asthma. In older child patients

Yang deficiency constitution becomes less common

while Yin deficiency constitution is gradually more popular. In combined constitution

phlegm and dampness constitution

and specific endowment are the most common ones. In older child patients

more children are combined with dampness and heat constitution

and gradually combined more Qi obstruction and blood stagnation constitution.