There are two types of postoperative instillation regimens for bladder cancer, one is BCG and the other is chemotherapy drugs. BCG: the preferred way for in situ bladder cancer or some high-risk superficial bladder cancer. Chemotherapeutic drugs: there are more kinds of chemotherapeutic drugs in the clinic, such as adriamycin: epirubicin, piroxicam, etc., or gemcitabine. The course of postoperative instillation for bladder cancer is usually once a week, usually maintained for 6 to 10 weeks, and then kept once a month for about half a year to a year, and the drug is retained in the bladder for about 60 minutes before urination. According to the stage of postoperative bladder cancer and different pathologies, there are different medicines and different cycles of postoperative bladder cancer irrigation, so the medicines should be used in regular hospitals under the guidance of doctors.