Objective:To study the epidemiology of attention-deficit hyperactivity disorder(ADHD) in pupils of Zhenjiang urban districts. Methods: Questionnaire was designed and employed for parents of 3 698 pupils at schools in Zhenjiang urban districts. ADHD was diagnosed according to the international DSM-Ⅳ scale. Differences were determined by Qi-square test and multiple regression analysis. Results: Prevalence of ADHD was 6.54% in pupils of Zhenjiang urban districts, and was 9.14% in male pupils and 4.01% in female. There was significant difference between 2 gender groups (? 2=34.933,P