ADHD, also known as attention deficit hyperactivity disorder, is a common type of psychological disorder in childhood. It is characterized by inattention and short attention span, hyperactivity and impulsivity that are inappropriate for age and developmental level, often accompanied by learning difficulties, aggressive behavior and maladjustment. The etiology and pathogenesis of this disease is unclear, and it is currently believed that the cause is often not single, but is caused by the interaction of a variety of factors together. 1, genetic factors: studies have found that the prevalence of ADHD children’s siblings is three times higher than normal, parents have a history of ADHD, or three generations of psychiatric history, and it has been pointed out that ADHD and dopamine gene polymorphism related. 2, neurotransmitters: neurobiochemical and psychopharmacological studies have found an imbalance of neurochemical transmitters in the brain, such as low dopamine and norepinephrine function and decreased 5-HT function in the blood and urine of patients. 3. Neuroanatomy and neurophysiology: Structural magnetic resonance imaging revealed abnormal frontal lobe development and bilateral asymmetry of the head end of the caudate nucleus in the patient. Functional magnetic resonance imaging also reveals defects in brain function in patients with ADHD, such as hypofunction of the frontal lobes. 4, pregnancy and childbirth factors: often associated with pregnancy and childbirth process, maternal pregnancy and childbirth comorbidities including gestational combined anemia, gestational hypertensive syndrome, gestational diabetes, or advanced age first birth, premature birth, overdue birth, cesarean section, history of medication use during pregnancy, etc. 5, family and psychosocial factors: family environment is also very important to the growth of the child, parental discord, improper education and other family factors can also become a cause of morbidity.