How long a patient with advanced rectal cancer can live is determined by the patient’s own specific conditions and treatment measures, but the overall survival period is relatively short. For patients with advanced rectal cancer, if their general condition is still acceptable and they have limited single metastases, the metastases can be completely removed by surgery and then combined with radiotherapy and chemotherapy, which can significantly prolong patients’ survival time and even achieve long-term survival. If the patient’s general condition is poor and the metastases are extensive, nutritional support therapy can be used to improve the patient’s quality of life, but the treatment effect is poor and the survival time is short, and the patient can die in a short time due to organ failure. Patients with advanced rectal cancer should maintain an optimistic attitude and actively cooperate with treatment to achieve the purpose of controlling symptoms, reducing pain and prolonging survival. Patients with advanced rectal cancer should eat more fresh vegetables and fruits to ensure the intake of fiber, avoid fatty foods, pickled foods, smoked foods, and eat more fish, shrimp, lean meat, soy products, dairy products and other foods rich in high quality protein.