The recurrence rate of postoperative prostate cancer is statistically about 50%, and the recurrence rate varies accordingly for different individuals. The analysis is mainly based on the patient’s pathological risk, as follows: 1. low-risk patients: relatively low postoperative recurrence rate, such as patients with focal early prostate cancer, have a low postoperative recurrence rate and a high 10-year survival rate; 2. high-risk patients: if the patient has PSA > 20ng/ml, Gleason score > 8, or with pelvic lymph node metastasis, their postoperative recurrence rate can reach 80% above. Postoperative prostate cancer is usually reviewed and observed regularly, including PSA, pelvic MR and whole body bone imaging. The results of these examinations are used for dynamic observation to assess whether patients need secondary treatment after surgery. Generally speaking, 20-30% of patients need secondary adjuvant treatment after surgery to better prevent prostate cancer recurrence.