Bladder cancer is one of the common tumors in the urinary tract, and the incidence of bladder cancer in China is increasing year by year, so it is especially important to prevent the occurrence of bladder cancer. The high incidence of bladder cancer seriously affects the health of human beings, so studying the causes of bladder cancer and taking effective measures to prevent it is the most effective way to prevent bladder cancer. Firstly, we should stay away from chemical carcinogens or take effective measures to minimize the exposure to chemical carcinogens. People engaged in dye industry, leather industry, metal industry and organic chemistry should wear protective clothing as much as possible during work to reduce the chance of skin contact with this harmful substance to minimize the occurrence of bladder cancer. Secondly, research shows that smoking is closely related to the occurrence of bladder cancer, so education on tobacco control and cessation can help raise people’s awareness and understanding of the serious hazards of smoking, so as to unify people’s understanding and quit the bad habit of smoking and reduce the occurrence of bladder cancer. Secondly, long-term application of analgesic drug finasteride or immunosuppressant cyclosporine A and cyclophosphamide can increase the risk of bladder tumor, so treatment with these drugs can be avoided as much as possible and can be replaced by drugs with less side effects in the same category. Finally, research shows that long-term chronic bladder lesions, such as bladder mucosal leukoplakia, adenocystitis, bladder stones, bladder schistosomiasis, etc., can easily cause bladder cancer, so timely treatment of the disease is one of the effective ways to prevent bladder cancer.