For routine urine examination, found that there are nitrites in the urine of the patient, or should be taken seriously. Because the urine routine found that nitrite is positive, on behalf of the patient’s urinary tract infection is more serious. Nitrite is an important indicator of infection, should be actively given sensitive antibiotics for treatment, and in the treatment should be rechecked urine routine, only when the nitrite turns negative after that shows that the treatment is effective. Especially for patients with urinary stones, if surgical treatment is required, antibiotic treatment is often needed before surgery. Surgery is only safe if the nitrites are negative, otherwise direct surgery may lead to more serious infections.