Invasive rectal cancer can adopt different treatments according to different stages, for example, early invasive rectal cancer can be treated with radical surgery, locally progressive rectal cancer can be treated with preoperative radiotherapy and surgery, and advanced inoperable or metastatic invasive rectal cancer can be treated with chemotherapy and other comprehensive treatments. 1. Early invasive rectal cancer: Surgery is the main treatment method for early rectal cancer, low anterior resection is feasible for early invasive rectal cancer in middle and upper segments, abdominal perineal resection is feasible for low early invasive rectal cancer, total mesorectal excision is feasible for early invasive rectal cancer in middle and lower segments. 2. Locally progressive invasive rectal cancer: preoperative neoadjuvant radiotherapy and chemotherapy combined with surgery is the main treatment method for locally progressive rectal cancer. Preoperative radiotherapy can effectively lower the stage and improve the rate of surgical resection, and radiotherapy can be chosen from three-dimensional conformal radiotherapy, intensity-modulated radiotherapy and other methods, and chemotherapy is often used in capecitabine single-drug program, and those who meet the surgical conditions after simultaneous radiotherapy can be treated by surgery. 3. Advanced, metastatic invasive rectal cancer: chemotherapy is the main treatment for advanced inoperable and metastatic invasive rectal cancer, commonly used chemotherapy programs include capecitabine combined with oxaliplatin program, fluorouracil combined with calcium folinic acid and oxaliplatin program, and some patients who have better response to chemotherapy and limited metastatic foci can be operated to have surgical resection of primary foci and metastatic foci after chemotherapy. It can also be combined with targeted and immunotherapy according to genetic testing and so on. There are different treatments for invasive rectal cancer according to different stages, and it is recommended that patients choose the suitable treatment for themselves under the guidance of doctors.