Currently, bladder cancer is divided into TNM stage according to international standards, with T representing the degree of tumor infiltration, N representing lymph node metastasis and number, and M representing whether distant metastasis occurs. When bladder cancer invades into the bladder mucosa and submucosa, it is classified as T1 stage; if bladder cancer invades into the muscularis propria, it is T2 stage for superficial muscularis propria, and T2a stage or T2b stage for deep muscularis propria. When the tumor breaks through the outer layer of the bladder, it can be classified as T3 stage, and if there is tumor infiltration visible to the naked eye under the microscope, it will be classified as T3a stage. If the tumor infiltrates the outer layer of the bladder, it can be stage T3b. If the tumor breaks through the bladder and invades the surrounding tissues or the pelvic wall it belongs to T4 stage. If the tumor has distant metastasis, it is also called advanced stage. Therefore, the treatment is different according to different stages. For superficial bladder cancer that has not infiltrated into the muscular layer, bladder mucosal electrodesiccation is usually performed. If it infiltrates into the muscle layer, total cystectomy is needed; if distant metastasis occurs or breaks through the bladder to infiltrate into the surrounding pelvic wall tissues belongs to the advanced stage, and can only be treated with radiotherapy and chemotherapy.