Testosterone standards after radical prostate cancer surgery are usually below 0.1 to 0.2 ng/ml. Abnormal expression of serum testosterone level may also be involved in the occurrence and development of prostate cancer. A large number of experiments have shown that serum T is low in prostate cancer patients, and a high level of T can effectively protect prostate tissue and reduce the risk of cancer. And the low expression of serum testosterone has been reported and confirmed to be related to the occurrence of bone metastasis in prostate cancer, which indicates that the level of testosterone may be closely related to the occurrence and development of distant metastasis in prostate cancer patients after surgery. Keeping the testosterone level low after radical prostatectomy for prostate cancer is favorable to the long-term survival of patients, and testosterone and prostate-specific antigen levels should be checked regularly after surgery.