Treatment of intestinal obstruction six months after rectal cancer surgery includes fasting, gastrointestinal decompression, total parenteral nutrition, antibiotic therapy, maintaining water electrolyte and acid-base balance. For intestinal obstruction, usually there are symptoms such as abdominal pain, abdominal distension and vomiting etc. At this time, it is suggested to fast to avoid frequent vomiting which may cause tearing and bleeding of esophageal mucous membrane; at the same time, gastric tube or nasojejunostomy tube should be inserted to perform gastrointestinal decompression to reduce intra-abdominal pressure, and then vomiting and abdominal distension will be relieved. If the patient is fasting or eating little during the illness, nutrition and energy deficiency, parenteral nutrition can be given to replenish fluids, such as supplemental amino acids, and according to the results of the blood biochemistry and blood gas analysis, replenishment of fluids to maintain water-electrolyte and acid-base balance (e.g., potassium supplementation). If symptoms are severe, prophylactic antibiotics such as ceftazidime and metronidazole may be considered to prevent infection. If the above treatments are still ineffective, or if there is a bloodless stool or intestinal perforation, surgery should be reconsidered when the situation permits. If problems are found, consult your doctor and cooperate with him/her.