The following precautions should be taken for lumbar puncture to extract cerebrospinal fluid: 1. In terms of body position, the main position is lateral, holding the knee, so that the waist is bent as much as possible, so that the vertebral space becomes wider, and only then can the puncture be successful. 2. Before puncture, strict positioning must be done, and then disinfected and laid on a towel, usually positioned in the lumbar 3, 4 or lumbar 4, 5 vertebral space. 3. 4. When extracting cerebrospinal fluid, too much should not be taken at once to avoid inducing brain herniation. 5. After successful puncture and needle extraction, the patient must lie flat on the pillow for 6 hours.