Objective To explore the types and distribution rules of TCM constitution for childrens postinfectious cough in Kunming.Methods We investigated the cases of postinfectious cough according to the constitution type standards.Result A total of 104 cases were investigated,the study indicated that the yang excess and yin deficiency of lung-spleen type was the main constitution type in childrens postinfectious cough,and constitution type was related to age grades,the type of infants constitution presented with yang deficiency of lung,spleen and kidney,yang excess and yin deficiency of lung-spleen type was the major type of postinfectious cough in children over I year old,balanced type with postinfectious cough mainly appeared in children over 3 years old.Conclusion The study is helpful to grasp the syndrome rules of childrens postinfectious cough in different constitution types and age grades,and provides information for making projects of prevention and treatments based on constitution.