Recurrent episodes of urinary tract infection include reinfection and recurrence. Most patients with reinfection have symptoms of urinary tract infection and are treated in the same way as the first episode. Patients with recurrence should choose strong bactericidal antibiotics according to the results of drug sensitivity test, and the course of treatment should not be less than 6 weeks. 1. Reinfection: most cases have symptoms of urinary tract infection, and the treatment is the same as the first attack. For those who have two or more episodes within six months, a long course of low-dose bacteriostatic treatment can be used, i.e., taking a small dose of antibiotics, such as ofloxacin, after urination before going to bed every night, and replacing the drug every 7 to 10 days for six months. 2. Recurrence: For recurrence and pyelonephritis, especially complicated pyelonephritis, on the basis of removing the predisposing factors (such as stones, obstruction, urinary tract abnormality, etc.), strong bactericidal antibiotics should be selected according to the results of drug sensitivity test, and the course of treatment should not be less than 6 weeks. For recurrent cases, a long course of low-dose bacteriostatic therapy should be given. Patients with recurrent urinary tract infections should seek medical attention as soon as possible, and use medication under the guidance of a professional physician, and should not take medication on their own to avoid delaying treatment.