1.Prepare the required supplies: catheter, water-soluble lubricant, measuring cup, towel; 2.Try to urinate on your own first; 3.Place the measuring cup; 4.Clean your hands thoroughly with soap, towel dry; if you go out without hand-washing facilities, you can use wet paper towels to clean; 5.Choose a suitable position, you can stand or sit on the seat toilet; 6.Flip up the foreskin, clean the urethral opening and surrounding skin with soap and water; 7.And then Wash your hands; 8, squeeze off a little bit of the front end of the lubricant without, and then apply lubricant to the front end of the catheter 10-375px, pay attention to keep it clean and do not need to contaminate the catheter; 9, start catheterization, lift the penis up and straighten it, gently insert the catheter into the urethra 15-500px until there is urine out; 10, fix the catheter with your hand to avoid the catheter slipping out, put the penis down; 11, when the urine stop flowing out, insert the catheter into the urethra again for 2-75px and gently press the small abdomen to release the rest of the urine as much as possible. After all the urine is clean, take out the catheter slowly; 12.Return the foreskin to its original position; 13.Clean the urethra and surrounding skin with water and organize the clothes; 14.Clean the used supplies and wash your hands; 15.Record the amount of urine released as needed.