ADHD, also known as attention deficit hyperactivity disorder (ADHD), is one of the most common disorders in children’s developmental behavior clinics, with a prevalence of 3-6%. It is mainly characterized by inattention, distraction, hyperactivity, impulsive behavior, learning difficulties, problem behavior, and mood disorders after school. The diagnosis of ADHD is based on the child’s medical history, assessment of the child’s performance using various scales, and the integration of various tests such as developmental assessment, psychological tests, attention measurement, EEG, and blood biochemistry to make a final judgment. There are both pharmacological and non-pharmacological treatments for ADHD. Medications such as methylphenidate hydrochloride and tomoxetine hydrochloride are commonly used and are safe and effective when administered under the guidance of a physician. Non-pharmacological treatments include behavior modification, attention training, cognitive-behavioral training, and parent training, among others. Children with ADHD show signs of being particularly active and inattentive in the kindergarten stage. Treatment of ADHD in early childhood differs from that of school-age children in that it focuses on behavior therapy, cognitive-behavioral therapy, play therapy, and parent training, etc. The goal of treatment is to adjust the child’s relationship with his or her surroundings, develop good behavioral habits, and prepare the child for school.