In 1944, Blalock reported the first case of successful surgical resection of lung metastases from colorectal cancer, which pioneered the surgical treatment of lung metastases from colorectal cancer, and since then, many units have also reported successful surgical treatment of lung metastases from colorectal cancer. Since then, many units have reported the successful experience of surgical treatment of lung metastases from colorectal cancer. At present, surgical resection is considered the only effective treatment for isolated lung metastases, and with the accumulation of experience in surgical treatment, more surgical experts believe that as long as the lung metastases can be completely resected, surgical treatment is recommended even if the metastases are multiple. According to the literature, the 5-year survival rate of surgical treatment can reach 22.0%-48.0%. However, the lung metastases of colorectal cancer are mostly accompanied by metastases from other sites, among which only 1%-2% of patients have resectable lung metastases. In 1965, Thomford et al. defined the indications for lung metastases resection surgery: 1. patients must be able to tolerate surgical treatment; 2. the primary cancer has been controlled; 3. there are no metastases from other sites; 4. lung metastases are confined to the lungs on X-ray. In 2009, the NCCN proposed the following criteria for the indications for surgery for lung metastases from colorectal cancer: 1) complete resection of the lesion and preservation of adequate lung function based on the anatomy and extent of invasion of the lesion; 2) the primary cancer has been radically resected; 3) resectable extrapulmonary metastases are not an absolute contraindication to resection of lung metastases; 4) recurrence of lung metastases in some patients can still be considered for surgery. Treatment.