In the context of the above research, this study retrospectively analyzed the preoperative expression of NMP22 and CSTB in evaluating the postoperative recurrence of bladder cancer and creatively discovered a new method for assessing postoperative recurrence of bladder cancer, which is a useful tool for clinical evaluation of postoperative recurrence of bladder cancer. The gene discussed is CSTB; the disease is urinary bladder carcinoma.