Self-intermittent catheterization is a relatively common method of bladder drainage in clinical practice, as shown below. 1. Generally, catheterization is carried out at intervals of 4 hours each time, and the volume of urine is maintained at 300 to 500 ml each time. The patient should also drink more water to maintain a certain volume of urine, which helps to prevent infection. 2. Specific methods of operation for the operation of the required items ready, often choose the appropriate catheter, the items will be sterilized, catheterization needs to be dipped in part of the paraffin oil to lubricate the catheter, and then slowly inserted into the urethra, until you see the urine out of the catheter, then you can continue to insert the 1 ~ 2 cm inward, followed by the release of the urine can be pulled out. 3. If the urine is found to be obviously turbid or even foul-smelling during catheterization, or accompanied by symptoms such as lumbar pain and fever, it suggests that the patient may have a urinary tract infection problem. Mild symptoms can shorten the catheterization time or drink more water to relieve, serious symptoms should be timely to the hospital urology department for treatment. In conclusion, home intermittent catheterization helps patients to learn self-care, the operation should be standardized, and abnormalities occur in a timely manner to the hospital.