Parents need to carefully observe and compare their children with those of the same age so that problems can be detected early and intervention can be made early. (1) Neonatal period: Most children are prone to crying, excitement, difficulty in putting them to sleep, night crying, waking up easily, jumping in fear, etc. (2) Infancy: About 30% of children with ADHD appear hyperactive and restless after birth, walking or running, falling easily, easily losing temper, easily provoked, often capricious and disobedient, sleeping less, parents complain that their children are difficult to bring up. Beijing Children’s Hospital Department of Neurology Lu Xiaoyan (3) early childhood: about half of the children with ADHD at this stage behave differently from other children, especially naughty and active, running around, not stopping, vulnerable, do not listen to parents, difficult to discipline, inattentive, can not be quiet for a moment to do a good job. Because of the hyperactivity, it is difficult for parents to arrange eating and sleeping activities. (4) Preschool age: can be manifested as naughty and active in kindergarten, particularly energetic, always can’t control themselves, can’t do things according to the teacher’s requirements, disobedient, inattentive, not serious, good to provoke children, is a trouble child in the eyes of the teacher. (5) school age: the symptoms are more typical, manifesting as inattention, hyperactivity and impulsivity. ADHD can affect learning, after elementary school requires children to improve control, need to be able to sit still, to pay attention to lectures, to complete homework on time, in school and friendly with classmates, which is difficult for children with ADHD, but also to teachers teaching difficulties. Often become the object of teacher complaints. (6) adolescence: after entering junior high school, some of the child’s behavior problems, such as hyperactivity, impulsivity will improve, as if they have become “obedient”, but in fact, the symptoms have only changed, inattention is still prominent, can not adapt to the learning tasks of secondary school, most of the study can not keep up, emotional instability, poor relationships with classmates. It is easy to appear anorexia, low self-esteem, more prone to a variety of emotional disorders, anxiety, depression, obsessive-compulsive and bipolar disorder. (7) Adulthood: Due to poor concentration, it is difficult to finish school, low work efficiency, poor planning, unstable career and marital status, poor emotional control, poor interpersonal communication, and more likely to participate in gambling, alcoholism, and do something illegal.