When rectal cancer is 3cm from the anus, it generally isn't possible to preserve the anus. Currently, the commonly used surgical methods for rectal cancer are the Dixon and Miles techniques. Generally, the threshold is 5cm from the anus; when the tumor is within 5cm of the anus, it often necessitates a Miles procedure, which does not preserve the anus. When the tumor is more than 5cm from the anus, an anus-preserving Dixon procedure can be performed. However, in considering the radical resection of rectal cancer, preserving the anus should not be the primary choice; instead, the main goal should be curative.