Objective To study attention deficit hyperactivity disorder (ADHD) children's bone age developmental level and body mass index and provide the basis of effective ADHD treatment and preventive measures. Methods From mental health department, 53 cases of 6~11 year-old patient newly diagnosed ADHD were selected as the observation group, in compliance with U.S.Diagnostic Statistical Manual of Mental Disorders (DSM-Ⅳ) diagnostic criteria.53 cases of healthy children with same bone age and actual age were chosen as the control group.Digital photography meter was used to shoot wrist bone X-ray, with a unified standard height and weight measurements, bone age standard evaluation method by CHN was used to judge wrist bone age film. Results Mean of difference between height age and actual age was significantly different (P<0.001) between observation group(0.8±1.1) and control group(-0.1±0.6);Mean of difference between bone age and actual age was significantly different (P<0.001) between observation group(1.1±1.0) and control group(1.0±0.4);Mean of difference between forecast lifetime height and genetic height was not different (P>0.05) between observation group(1.5±5.8)and control group(-0.1±22.1).Mean of body mass index (BMI) in two groups(observatina group 18.1±3.5, control group 16.2±2.3) had differences (P<0.05). Conclusion For children with ADHD, bone age developmental level is earlier and BMI is higher than healthy children.Yet, it does not affect final height during adulthood.