Peritoneal metastasis of bowel cancer refers to the invasion of peritoneum by cancer cells of bowel cancer lesions through direct infiltration metastasis, blood transport pathway, lymphatic pathway and implantation metastasis. It suggests that the patient is in the late stage of the disease. Bowel cancer is a common malignant lesion in the digestive system, which is in the early stage of the disease and the lesion is limited, so metastasis usually does not occur. When the cancer continues to develop and become larger, and penetrates the muscle layer, it may metastasize to the surrounding tissues and distant organs. The metastatic pathways of cancer cells mainly include direct infiltration metastasis, blood transport pathway metastasis, lymphatic pathway metastasis and implantation metastasis. No matter which route, it may lead to peritoneal metastasis. When peritoneal metastasis occurs in bowel cancer patients, it means that the patients are in the late stage of the disease, and their condition is very serious, so they should receive regular treatment under the guidance of doctors.