Urodynamic examination mainly studies the function of the bladder to store urine and excrete urine by the flow rate and volume of urination, residual urine volume, and pressure in the bladder. Main examination procedure: 1. One hour before the examination, ask the patient to drink 500ml of cool boiled water and wait until the patient feels the urge to urinate with a distended bladder before starting the examination. The urine flow rate and urine volume will be tested first. 2.After the test is completed, a thin tube for the test is placed into the bladder and the residual urine volume is measured first, and then the pressure and bladder volume in the bladder are measured, along with electromyography activity to see if the forceps and sphincter are coordinated. 3.After the above tests are completed, the final bladder pressure test is done after the voiding period. The tube is placed on the urethral pressure machine to measure the urethral pressure at rest state or when coughing and exerting to comprehensively evaluate the bladder function of the patient. The urodynamic tests include uroflowmetry, urethral manometry, volumetric manometry of the injected and voided bladder, and electromyography to determine whether the patient has abnormal bladder function through the above items. It should be noted that after the examination is completed, patients may have painful urination or a little hematuria in the early stage, which are relatively normal, and pay attention to drink more water to be able to improve the uncomfortable symptoms. In conclusion, urodynamic testing is currently a better test to check bladder function and needs to be performed in a regular hospital.