Enhanced CT can determine rectal cancer lymphatic metastasis. Rectal cancer lymphatic metastasis can be judged by enhanced CT. Rectal cancer lymphatic metastasis is manifested as lymph node hyperplasia and enlargement on enhanced CT. Enhanced CT can also determine the location of rectal cancer, the size of the mass, the depth of infiltration, etc. It helps doctors to stage the tumors of rectal cancer patients before operation and make reasonable treatment plan according to the staging. For patients who are allergic to contrast agent, have serious damage to liver and kidney function, or have heart failure and are not suitable for enhanced CT, they can choose magnetic resonance examination, which has a higher resolution for soft tissues and does not cause radiation to patients, and whether there is lymphatic metastasis in patients with rectal cancer can be more clear and definite through magnetic resonance examination. Therefore, enhanced CT can find lymphatic metastasis of rectal cancer. Rectal cancer patients should go to the hospital in time when lymphatic metastasis is detected, and choose appropriate treatment under the guidance of doctors to avoid further development of the disease.