PSA is the abbreviation of prostate-specific antigen. The optimal value of PSA after prostate cancer surgery is less than 2ng/L, but with some individual differences. Under normal circumstances, the PSA index of the prostate is 0~4ng/L. After prostate cancer surgery, the PSA index of the prostate will gradually decrease and slowly return to normal. However, it takes a period of time for the PSA left in the blood to be completely metabolized out of the body after the prostate cancer surgery, so the PSA value is still high within a short period of time, and it will gradually decrease about three months after the surgery. Generally speaking, if the PSA index is between 0~4ng/L after prostate cancer surgery, it means that the condition is under good control; if the PSA index continues to rise through review, it means that the control effect is not good and it is a precursor of prostate cancer recurrence. It is recommended to go to the hospital for regular review after prostate cancer surgery, and the doctor will adjust the post-surgery treatment program appropriately according to the PSA index.