Due to frequent poor defecation, fecal accumulation in the colon can form hard fecal stones, or secondary megacolon, most of which affect growth and development, and can also cause vaginitis or upstream infection. Examining the anus, it is common that the buttocks are flat and round, the gluteal groove becomes shallow, there is no hole or only a trace at the anus, and in cases of low deformity, the swelling of the blind end of the rectum can be palpated by finger palpation. Fecal stone intestinal obstruction is a kind of mechanical intestinal obstruction caused by intestinal fecal stones, etc. Early diagnosis is difficult. Diagnosis of formation of hard fecal stones in the colon: 1. Chronic bacterial dysentery: manifested as chronic diarrhea or mucopurulent stools, but often with a history of acute bacillary dysentery. Culture of exudate obtained from stool, cecum swab or colonoscopy can isolate Bacillus dysenteriae. 2, chronic amoebic enteropathy: often have a history of travel to the epidemic site, the lesion is mainly in the right colon, colonic microscopy can be seen mucosal ulcers, ulcer margins are subterranean, between the ulcer colonic mucosa is normal, can be found in the stool lysis group amoebic encapsulation or trophozoites, treatment with anti-amoebic drugs effective. 3, schistosomiasis: can also have chronic diarrhea abdominal pain, but there is a history of contact with epidemic water to endemic areas, the stool can be detected positive for schistosome eggs or hatching trichurias. On colonoscopy, typical manifestations such as submucosal yellow granules can be seen, and eggs can be found in cecum or sigmoid mucosal biopsies. In addition, patients often have hepatosplenomegaly, and in severe cases, ascites may appear, and the symptoms improve after effective anti-schistosomiasis treatment. 4, Crohn’s disease (crohn’s disease): a wide range of lesions, from the esophagus to the anus of the gastrointestinal tract can occur lesions, to the end of the ileum and the right hemicolectum is more common. Clinical manifestations can resemble ulcers, but often no blood stool, abdominal pain, mucus stool is common.