A method for treating urinary system disorders comprising: a pharmaceutical composition comprising a carbon material and a water-containing carrier, the pharmaceutical composition comprising a carbon material in an amount from 0.001 mgs to 100 mgs, both of the carbon material and the water-containing carrier constitute a pharmaceutically acceptable water-containing carrier carrying the carbon material, and the carbon material having a diameter falling within a range from 2 nm to 2 mm; Then instilled this pharmaceutical composition into the bladder for adsorb LPS of bacteria, aqueous vehicle in a volume of from 50 mL to 700 mL. After adsorb, discharging the LPS together with urine out of cystitis patients. This method is capable of reducing symptoms of cystitis by contacting the carbon material with a bladder or related tissues of the bladder in an animal body.