Sodium phosphate oral solution is usually excreted about 6 to 8 times, the exact number of times varies from person to person. Sodium phosphate oral solution belongs to the laxative, usually used to do colonoscopy before cleaning the intestinal tract, after taking the drug can soften the feces, stimulate defecation, generally have to excrete about 6~8 times, but the intestinal cleanup preparation is not based on the number of times of defecation, but according to the discharge of feces to determine the nature of the feces, if the discharged feces is watery without fecal slag, that intestinal cleanup to achieve the standard state of doing a colonoscopy. Therefore, before doing colonoscopy, try to eat less food with slag, follow the doctor’s instructions to take sodium phosphate oral solution, and do a good job of intestinal cleaning can provide a clear vision for doing colonoscopy, which can improve the accuracy of the examination.