1. Tend to fail to pay careful attention to details during study, work or other activities, or often make mistakes due to carelessness. 2.When studying, working or playing activities, attention is often difficult to last. 3. Tend to be distracted and seem to listen when conversing with them. 4. Often fails to follow instructions to complete homework, daily chores, or work (not due to oppositional behavior or lack of understanding of instructions). 5. Tend to have difficulty completing homework or activities. 6. Tends to avoid, dislike, or be unwilling to participate in assignments or tasks that require sustained energy, such as doing homework or chores. 7. Tend to lose things necessary for homework or activities, such as toys, textbooks, homework, pencils, or other learning tools. 8. Tend to be easily distracted by external stimuli. 9.Tend to forget daily activities. 10.Tend to have many small movements of the hands or feet, or squirm in their seats. 11.Tend to leave their seats without permission in the classroom, or on other occasions where sitting is required. 12.Tend to run around or climb up and down too much in inappropriate situations (adolescents or adults, it may just be a subjective feeling of fidgeting). 13.Tend to be unable to participate quietly in games or after-school activities, and is constantly active, as if a machine is driving him. 14.Tend to talk too much and rush to answer before others (teachers) have finished asking questions. 15. Tends to have difficulty waiting quietly for turns to interrupt or interject when others are talking or playing. At least 6 or more, appearing before age 7, lasting more than 6 months, and present in more than two settings, such as at school, in the studio (or clinic), or at home. Pervasive developmental disorder, schizophrenia, or other psychiatric disorders were ruled out and could not be explained by other psychiatric disorders, such as mood disorders, anxiety disorders, dissociative disorders, or personality disorders.