The ph value of the human intestinal tract is generally 6.8 to 7.0, but the exact ph value of the rectum is not known. The intestinal tract is an important digestive organ of the human body, from the pylorus of the stomach to the anus, it is the longest section of the digestive tube, including the small intestine, large intestine and rectum. Digestive enzymes in the intestinal tract are highly active in an alkaline environment, so the intestinal ph value remains alkaline in favor of the body’s digestion and absorption of food, the ph value of the human intestinal tract is generally in the range of 6.8~7.0, but the rectal ph value is not yet clear. If the ph value of human intestine is less than 6.8, it is acidic, and if it is more than 7.0, it is alkaline. Low or high intestinal ph value may lead to intestinal bacterial colony disorders, which may lead to constipation, diarrhea and other symptoms. If the ph value of human intestines is abnormal, it should be further clarified, and after the doctor clarifies the cause, targeted treatment will be given.