Constipation is one of the common gastrointestinal symptoms in pediatrics, which is divided into functional constipation and organic constipation according to the nature of constipation, among which functional constipation is a common cause of defecation disorders in children, accounting for more than 90% of pediatric constipation and 25% of pediatric gastrointestinal clinics. Although functional constipation is not a life-threatening disease, it can affect the quality of life of children over time and may even have adverse consequences on growth and development. In infants and young children, a delay in defecation for more than 3 days may cause pain during dry stools and lead to anal fissures and anal spasms, eventually causing the conditioned reflex of not daring to defecate, therefore, active intervention and medication are necessary. Etiology: Children have different causes of constipation at different ages, but most of them are functional, clinically known as idiopathic or habitual constipation. Functional constipation tends to cause abdominal distension, crying and refusal to eat in children, which affects their quality of life. The main causes are: 1, pelvic floor muscle coordination disorders; 2, insufficient dietary fiber intake; 3, poor mental factors and defecation habits; 4, abnormal secretion and regulation of gastrointestinal hormones affecting gastrointestinal motility; 5, intestinal micro-ecological flora disorders. The purpose of treatment is to improve the symptoms, eliminate the causes and restore the physiological function of normal intestinal peristalsis and defecation. Basic treatment, pay attention to the usual care: 1, adjust the diet: emphasize giving breastfeeding, stop or reduce milk powder to increase the intake of coarse fiber and food containing more residue, reduce the intake of fine food and food containing less residue, appropriate hydration; 2, train children to defecate regularly and develop habits; 3, arrange an appropriate amount of outdoor activities every day; 4, pay attention to the observation and exclude abnormal mental factors in infants and children. Medication: 1) probiotics; 2) lactulose oral solution; 3) Chinese medicine: you can choose Chinese medicine to clear heat and appetite, such as: Wang’s Bao Chi Wan, Jian’er Qing Jie Liquid, anti-feeding and anti-fever soup syrup, pediatric black bean pellets, etc.