Now that China has entered an aging society, the incidence of prostate enlargement patients is increasing. Patients are mostly used to having ultrasound examinations, which can report the morphology of the prostate, but cannot assess the degree of urethral obstruction and the functional status of the bladder. The currently accepted assessment method is urine flow rate examination. Uroflowmetry is a non-invasive and relatively inexpensive test. Urine flow rate measurement is very important for patients with prostate enlargement, not only to determine whether prostate enlargement needs to be treated, but also to determine the efficacy of the treatment. The rate of urine flow is the amount of urine that is discharged from the urethra per unit time, which is the rate of urine flow. Measurement of the urine flow rate is used to diagnose lower urinary tract obstruction and to assess the degree of obstruction. A clinical urine flow rate meter is used to measure the rate of urine flow and to trace the curve of the continuous flow of urine. The patient is required to hold the urine until the bladder is full and then urinate into the funnel that collects the urine. The maximum urine flow rate is the easiest and most reliable parameter and is a preferred and essential screening test for most patients suspected of having lower urinary tract dysfunction. Since prostatic hyperplasia is an important cause of lower urinary tract obstruction, this test is also performed mainly on patients with prostatic hyperplasia. The reliability of the test is higher when the bladder volume is between 200 and 400 ml, and decreases if the urine volume is less than 150 ml. A maximum urine flow rate of less than 15 ml per second is considered to indicate the presence of obstruction, and less than 10 ml per second indicates the presence of severe obstruction.