Urinary tract infections can be cured if treated by infusion, usually for a week. However, if the drug is resistant to the infected bacteria during the infusion, the infusion will be ineffective. Therefore, if the urinary tract infection is treated by infusion, it is recommended to keep the middle urine for bacterial culture and perform a drug sensitivity test to select the most sensitive antibiotics for treatment, which can achieve a complete cure by infusion for one week. Most of the bacteria seen clinically for urinary tract infections are Escherichia coli, followed by Klebsiella pneumoniae, or Pseudomonas aeruginosa. Clinically, quinolones, such as ciprofloxacin and ofloxacin, are usually chosen empirically for intravenous infusion therapy. However, there are now about 40% of bacteria that are resistant to quinolones. If the bacteria are resistant, the course of infusion, even if lengthened to 10 days, still can not cure the urinary tract infection. Therefore, patients who have the conditions, try to select urine culture and drug sensitivity test, for sensitive bacteria to select the targeted antibiotics, to achieve the purpose of complete cure.