Male catheterization is widely used in urology, when doing catheterization, we must pay attention to the principle of asepsis, before performing catheterization, the doctor needs to wash his hands and disinfect them, and wear a mask and cap. The order of disinfection for male catheterization is to take the penis as the center, disinfect a range of about 15cm in diameter to the surrounding area, and then focus on disinfecting the part of the glans. In the process of urinary catheterization, must strictly follow the operating procedures, first of all, to check whether the instrument is complete, after disinfection, the catheter will be inserted into the urethral orifice, slowly inserted after about 20 cm, you can see the urine flow, and then inserted into the inward about 2-4 cm, injected into the balloon of about 10mL, fixed the bag of urine, the entire catheterization is complete.