Colorectal cancer refers to malignant lesions of the colorectal mucosal epithelium caused by a variety of carcinogenic factors such as the environment or genetics. It has a poor prognosis and a high mortality rate. It is one of the common malignant tumors in my country. Among them, malignant tumors arising from the mucosal epithelium are collectively referred to as colorectal cancer, which is the most common malignant tumor of the gastrointestinal tract. Those originating from mesenchymal tissue are called sarcomas, which account for about 1% of colorectal malignant lesions. The average 5-year survival rate after surgical resection can reach 40% to 60%. Early detection, early diagnosis, early treatment and standardized surgical treatment are still the key to improving the efficacy of colorectal cancer.