ADHD is one of the most common psychological and behavioral disorders in childhood, with a prevalence rate of 3-5%. It not only affects the children’s own learning and life, but also brings troubles to parents, anxiety to families, trouble to schools, and even causes some social problems. Therefore, for ADHD, we should do early detection and early treatment, we can achieve good treatment results, so that these children can grow up healthy. 1, the onset of early, difficult to self-heal ADHD is a chronic disease, the onset of early, mostly in the preschool years began to have a variety of behavioral abnormalities. Parents and teachers are often unaware of this, so they wait until the symptoms are obvious before finding out. So how can ADHD be detected early, especially in preschool? The following aspects should be taken seriously if they are present: 1. Infancy and early childhood: mainly poor regularity of life. Often manifested as excessive activity, tireless, disobedient, difficult to discipline; sleep disturbance, feeding difficulties, throwing toys, excessive crying, easily provoked, mothers often resent their children difficult to raise. 2. Preschool age: inattentive, overactive, refuses to sit still, unwilling to learn, disobedient to management, temper tantrums, destroying things, throwing toys all over the place, not caring, not organizing, likes to fight with children, aggressive, impulsive behavior, etc. 3.Early school age: They are often known as the “King of Pi” in the class, interfering with others, causing trouble, easily getting excited, losing temper, and not getting along with their classmates. They often have learning problems, such as slow reaction in class, confusion in answering questions, and poor memory related to learning. They have short attention span when doing homework, procrastinate on homework, or do other things while doing homework, and need strict supervision by adults. ADHD was previously thought to be a childhood disorder that would heal on its own when the child grew up. However, recent studies have found that ADHD symptoms can be long-lasting and difficult to resolve on their own. About 1/3 of children with ADHD will disappear by the age of 18, and various social functions will basically return to normal; another 1/3 of symptoms will last until adulthood; the remaining 1/3 of ADHD symptoms will last a lifetime. The core manifestations of ADHD are inattention, hyperactivity and learning difficulties, but more than half of the children also have many other co-morbidities, such as oppositional defiant disorder, conduct disorder, depression, anxiety, tics, epilepsy, sleep disorders, and language disorders. The presence of these co-morbidities makes the symptoms of ADHD more severe and complex, and makes treatment more difficult. If not treated in a timely manner, the symptoms of ADHD will gradually worsen and be very harmful. 1, the impact on the individual: children with ADHD gradually develop learning difficulties due to various behavioral problems. They also often get into trouble, fight, steal, vandalize, and even take the road to crime. Due to teacher criticism, parental scolding and classmates’ cold treatment, they will gradually develop various abnormal psychology. 2, the harm to the school: ADHD children often do not discipline, interfere with classmates, and even fight, steal, do bad things, the result not only affect their own learning and other students, but also affect the teaching of the whole class, “dragging the whole class back. 3, the impact on the family: looking at the child’s bad behavior and increasingly poor academic performance, parents are very anxious and irritated, can be repeated education, “chaperone”, hire tutors, and even take stick education, wasting a lot of time, money and energy, but also to no avail. Parents will lose confidence in their children, while the children will appear depressed, confrontation, hatred and other abnormal emotions, affecting family harmony. 4, the harm to society: the more severe ADHD children to adolescence can be manifested as academic wastage, aggression, anti-social behavior, social maladjustment, lack of self-esteem, mutual fighting, and even embark on the road to crime, affecting social stability and harmony. 3, early detection, early treatment Although the course of ADHD is long and harmful, but if early detection and early treatment, you can achieve satisfactory treatment results. The treatment of ADHD should pay attention to the following points: 1, early treatment: children’s behavior abnormalities should be detected early, early treatment, can achieve good therapeutic results. Intervention and treatment should be carried out when behavioral abnormalities are detected in kindergarten or lower elementary school students. If you wait until the child’s various symptoms are obvious and the harm is serious before treating them, the treatment effect will be significantly reduced. 2, comprehensive treatment: requires the participation of parents, teachers, doctors and the whole society, mutual coordination and cooperation, in order to achieve the maximum effectiveness. Often need to use a variety of methods, such as drug therapy, psychological behavior therapy or parent training methods for children with comprehensive treatment, in order to complement the strengths and weaknesses to achieve the best therapeutic effect. Long-term treatment: ADHD symptoms can last for a long time, even for life, and its various negative effects also exist for a long time. Therefore, the treatment of ADHD should also be long-term, often requiring several years of treatment to achieve more satisfactory results. If the treatment time is very short, it will obviously affect the effect of treatment.