Introduction: Bladder cancer is the most common tumor in the urinary system. Most of them are metastatic epithelial cell carcinoma. The incidence of bladder tumors ranks 2nd after prostate cancer among male genitourinary tumors in foreign countries, and takes the first place in China. The natural survival period of bladder cancer in non-therapeutic cases is roughly 16-20 months, and the survival period of those treated varies, and the longest can be decades. Transurethral bladder tumor electrosurgery is both an important diagnostic method for non-muscle invasive bladder cancer to clarify pathological diagnosis, tumor grading and staging; and also a major treatment tool. This procedure can remove the tumor by simply placing the electrodes into the bladder through the urethra, and the surgical resection includes the normal bladder tissue within 1 cm of the tumor. It is less painful, more effective and safer for patients, and most patients can be discharged within a week. Adjuvant treatment after surgery: Since bladder cancer is multicentric and multiple, 10%-67% of patients recur within 12 months after TUR-BT, and 24%-84% recur within 5 years after surgery, and the recurrence may not be in the original location, so regular intravesical bladder infusion chemotherapy is needed after surgery, which is easy to operate, effective and the main means to prevent tumor recurrence. After removing the urinary catheter about 1 week after TUR-BT, bladder irrigation should be started (first once a week for 8 times in a row; then once a month for 10 times in a row to maintain at least 1 year). Do not drink a lot of water before bladder irrigation, and the bladder should be emptied. After the drug is injected into the bladder through the urinary catheter, various positions should be changed, such as lying down, lying on the left side, lying on the right side, lying down, etc., so that the drug can contact with all parts of the bladder to improve the therapeutic effect. After perfusion, the drug should be kept in the bladder for 0.5 to 2 hours and then excreted naturally, and the side effects such as pressure pain and hematuria should be observed. If bladder irritation is more obvious after perfusion, some medications can be taken as prescribed by the doctor. Post-operative review The cystoscopy will be reviewed regularly from 3 months after surgery, every 3 months in the first two years, every 6 months from the third year, and annually after the fifth year until lifetime.