It is a new discipline to study the function of urinary tract transport, storage and discharge of urine by means of fluid dynamics and electrophysiological methods, and is one of the routine examination techniques in urology. 1.Which patients need to do urodynamic examination? Patients with urinary dysfunction who have symptoms such as urinary frequency, urinary urgency, urinary waiting, urinary incontinence, urinary difficulty or even inability to urinate. 2.What is the purpose of urodynamic examination in patients with prostatic hyperplasia? The purpose is to assess the presence or absence of bladder outlet obstruction and bladder forced urinary muscle dysfunction, which is an extremely important reference for the choice of treatment and the prognosis of surgery. 3.What is the urodynamic test recommended by the doctor? It is a non-invasive test, which is economical and simple, because the patient only needs to pee into the machine. It is a non-invasive test that is both economical and simple because the patient’s own description of urination is often subjective, while the doctor needs the data recorded objectively by the machine.