Functional fecal emission, also known as non-organic fecal emission, also known as functional fecal incontinence, is a process of involuntary excretion of normal feces in a place other than the toilet, at least once a month and for more than 3 months, in children about 4 years of age, in the absence of organic disease. Most of the defecation is usually in the underwear, and sometimes the fecal pieces fall in the corners of the house, corridors of kindergartens and schools, parks, etc. Defecation mostly occurs when the child is standing, especially during exercise, walking, playing, or even while taking a bath, causing the stool to float in the bath tub. The stool is normal in nature, not diarrhea, and the physical examination is not abnormal. The incidence of functional fecal retention has been reported differently. One survey found that the incidence was 4.1% in children aged 5-6 years and 1.6% in children aged 11-12 years, and the incidence was relatively higher in boys and children in poor areas. It was also found that only 37.7% of children aged 5-6 years with fecal impaction and 27.4% of children aged 11-12 years had been seen for this problem. Another study reported that the prevalence of the problem in children aged 4-7 years ranged from 1% to 3%, with a sex ratio (male:female) of 2.5 to 6.0:1; the incidence varied by age, with 2.8% in 4-year-olds, 2.2% in 5-year-olds, 1.9% in 6-year-olds, 1.5% in 7-8-year-olds, and 1.6% in 10-11-year-olds. One of the reasons for the variation in its incidence may be related to the different diagnostic criteria mentioned above and the population investigated, but all these data are considerably higher than the clinicians’ estimates. The etiology of functional enuresis in children is diverse, involving family, school, environment, and interpersonal relationships, and is the result of the interaction of multiple factors, and its mechanism of occurrence may be related to genetic factors, delayed maturation of the nervous system, inappropriate educational methods, and psychosocial factors. Many investigations have shown that functional fecal impaction in children is closely related to functional constipation. Constipation is very common in children, with a prevalence of 0.3%-28%, and is mostly functional. About 80% of children can be completely cured within 5 years, but it is more difficult to be cured when combined with functional enuresis. Fecal incontinence occurs in 79% of children with constipation. Ninety-five percent of children with uncontrolled bowel movements have functional constipation. Constipation is the result of prolonged retention of feces in the rectum, which causes overdistension of the rectum and a decrease in receptor sensitization. When the distal rectum is overstuffed, the rectal motor sensory function is impaired, causing spontaneous relaxation of the anal sphincter. When the rectum is full of feces and its pressure exceeds the sphincter contraction, it is likely to cause fecal retention, resulting in both constipation and fecal retention symptoms. This type of fecal incontinence often occurs in two ways: one is proximal to the rectum. The newly formed feces in the intestine leaks out from around or in the middle of the fecal mass blocked in the distal colon or rectum; one is when the fecal mass accumulates to a certain extent in the rectum, the sick child is dulled by the transitional expansion of the intestinal wall, making it difficult to form an effective defecation reflex, and the fecal mass falls out of control into the crotch, thus calling these fecal incontinence with constipation symptoms fecal staining. Therefore, constipation is the most common pre-existing symptom leading to fecal impaction. Strong mental stimulation, excessive emotional excitement and severe trauma have an inhibitory effect on the defecation center of the cerebral cortex, which can lead to its inability to complete the normal defecation action, resulting in loss of anal control to make the stool overflow. If during the critical period of developing good defecation habits, there is a major adverse event that causes extreme psychological fear or mental inhibition in children, it will affect their ability to master defecation and develop regular defecation habits, so that they will not choose the toilet or potty, and cause fecal retention disorder. Some school-age children are often reprimanded or discriminated by parents and teachers because of their heavy study load or poor academic performance, or they are stressed and anxious because of their rough educational methods, which can cause the phenomenon of fecal emission. Currently, some scholars believe that the denervation of the anal sphincter is one of the causes of functional fecal emission, that is, the nerve damage of the innervated anal sphincter, mainly due to the injury of the pubic nerve innervating the external anal sphincter, and Pakarinen et al. found that the latency period of the pubic nerve terminals in patients with functional fecal emission is significantly longer than that in normal subjects, which slows down the nerve conduction and prevents the anal sphincter from contracting in time. The result is that the anal sphincter does not contract in time, leading to fecal loss. The anorectal manometry introduced by the second department of general surgery of our hospital can exclude various organic pathologies. The anorectal manometry introduced in the second department of general surgery of our hospital can exclude all kinds of organic pathologies, which is of definite significance for diagnosing the disease. Once the diagnosis of the disease is confirmed, we should look for the causes in terms of diet, bowel habits and psychological aspects of the child. Children with constipation should be given appropriate laxatives and good bowel habits should be developed. The diet should include fiber-rich foods, increase the variety of foods, and prevent over-refinement of the diet. Children with psychological stress should be less critical and school teachers should be told to encourage children more and to tell teachers and parents if they have the urge to defecate to prevent holding the stool from eventually causing a sluggish defecation reflex and incontinence.