If there are abnormal polyps in half a year after colon cancer surgery, biopsy should be performed to determine whether they are benign or malignant lesions, and alert to the possibility of recurrence, so as to carry out targeted treatment. Benign lesions: If the polyps are inflammatory or hyperplastic, they are benign lesions, and it is recommended to remove them under colonoscopy to prevent the polyps from increasing, causing bleeding, constipation and even malignant lesions. Malignant lesions: the recurrence rate of colon cancer is high within 3 years after surgery, if there are polyps in the recheck and the pathology suggests that there are cancerous lesions, recurrence should be considered and endoscopic or surgical resection treatment is recommended. It is also recommended to carry out lymph node dissection after surgery to determine whether there is any metastasis. Regular follow-up colonoscopy is recommended after colon cancer surgery, and timely treatment should be carried out if there is any abnormality.