MRI can determine whether prostate cancer has lymph node metastasis. MRI has an advantage over CT in that it is highly valuable in detecting prostate cancer and determining its size, extent, and the presence of lymph node metastasis. MRI can detect the enlargement of pelvic lymph nodes and lymph nodes in other parts of the body due to metastasis, and it is also easy to detect other organs and bone metastasis. In addition, MRI is the best imaging method for prostate cancer staging. However, it should be combined with other examinations. Pelvic lymph node dissection is the best method to detect whether prostate cancer has lymph node metastasis or not, and MRI has certain limitations compared with pelvic lymph node dissection. The greater the number of lymph nodes biopsied in pelvic lymph node dissection, the greater the possibility of detecting lymph node metastasis. To determine whether prostate cancer has lymph node metastasis, it is recommended to go to regular hospitals and conduct examinations under the guidance of doctors to avoid delaying the condition.