The overall recurrence rate of bowel cancer surgery is not high. Bowel cancer is divided into colorectal cancer and small bowel cancer, which generally refers mainly to colorectal cancer, which is the so-called colorectal cancer, because the relative incidence of small bowel cancer is low, while the incidence of colorectal cancer is high. And as life expectancy increases, the probability of developing tumors in the population is getting higher, almost 5%. Recurrence after surgery is directly related to the stage of bowel cancer at the time of detection and treatment. Early detection, early treatment and persistent follow-up after surgery will result in relatively low recurrence rate. Even after surgery, radiotherapy and chemotherapy in middle and late stage, the recurrence rate is still high. Generally speaking, recurrence is more frequent within 2 years, so we need to pay attention to the first 2 years and review regularly.