After the cerebrospinal fluid is drawn, it is usually necessary to lie down for 4~6 hours to avoid discomfort. Cerebrospinal fluid extraction is mainly through lumbar puncture, usually the patient needs to bend side lying on the bed, hands holding the knees for puncture, when the cerebrospinal fluid drops out, but also need to insert the needle core, the puncture needle will be pulled out, and the use of gauze for fixation. The patient needs to lie down for 4~6 hours after the gauze fixation to prevent headache, brain hernia formation, infection and other conditions. This approach can be used clinically not only for drawing cerebrospinal fluid, but also for diagnosing high and low intracranial pressure, performing spinal cord or pneumoencephalography, etc. It can also be used for intrathecal injection of drugs to treat inflammation or tumors. Before lumbar puncture, patients should pay attention to the local soft tissues and skin without inflammation, and patients with elevated intracranial pressure and signs of brain herniation should not undergo the procedure. At the same time, patients in shock or with spinal cord compression symptoms, etc., can not be punctured. It is recommended that patients draw cerebrospinal fluid strictly under the guidance of the doctor and take good care of themselves so as not to affect the postoperative recovery.