Urinary tract infections are usually divided into the following two types: i. Simple urinary tract infections, which refer to urinary tract infections that occur when the anatomical structure and function of the urinary system are normal and the patient does not have immunocompromising diseases or comorbidities such as diabetes mellitus, which are usually cured in a short time with antibiotics and usually do not affect the patient’s kidney function. The main subtypes are acute simple cystitis and acute simple pyelonephritis. Second, complicated urinary tract infection, refers to patients with other diseases, such diseases can increase the symptoms of urinary tract infection and increase the chance of urinary tract infection. These patients have concomitant urinary tract infections, such as patients with abnormalities in the structure and function of the genitourinary tract itself, or patients with other concomitant diseases. The concomitant diseases can be divided into two categories according to their status: 1) concomitant diseases that can be removed by treatment, such as treatment of internal stones and removal of indwelling catheters; 2) concomitant diseases that cannot be removed or cannot be completely removed, such as permanent indwelling catheters, or residual stones or neurogenic bladder.