The following precautions should be taken for lumbar puncture to extract cerebrospinal fluid: 1. In the lateral position, the main position is lateral, but the knees must be held in the lateral position, so that the waist is bent as much as possible to make the intervertebral space wider and to make the puncture successful. 2. 4. When extracting cerebrospinal fluid, too much should not be taken at once to avoid sudden brain herniation. 5. After successful puncture and needle extraction, the patient must lie flat on the pillow for 6 hours.