Normal routine urine examination shows that the white blood cells should be (-) results, if there is a positive result of white blood cells (+), then consider the presence of urinary tract infection, but also does not exclude the retention of urine in the process of specimen contamination, it is recommended that according to the symptoms: 1, if the urine routine examination of white blood cells (+), accompanied by frequent urination, urinary urgency, painful urination, back pain and abdominal pain and other discomfort, then you can consider the presence of urinary tract infection. Further bacterial culture of the middle urine can be performed to clarify what bacterial infection is present or what drugs are more sensitive to it. The quinolone antibiotics can be selected empirically, or the most sensitive antibiotics can be selected for treatment according to the drug sensitivity results. 2. If the patient does not have any conscious symptoms, it is recommended that the morning urine be retained again for routine urine examination to rule out whether it is due to specimen contamination. If the result is still (+), the presence of urinary tract infection is considered, but some patients can be asymptomatic, called asymptomatic bacteriuria. It is recommended to treat with antibiotics, and one capsule of levofloxacin hydrochloride can be taken three times a day for five consecutive days orally before rechecking the urine routine to find out whether the leukocytes in the urine routine return to a (-) result.