The purpose of lying flat for 6 hours after lumbar puncture is to prevent excessive flow of cerebrospinal fluid and headache. After lumbar puncture, it is generally required to lie down for 4~6 hours, the purpose of which is to make the cranial brain and lumbar spine at the same level, reduce the outflow of cerebrospinal fluid from the puncture port, and also prevent the excessive outflow of cerebrospinal fluid from causing a decrease in intracranial pressure, which may cause a headache. Lumbar puncture to extract cerebrospinal fluid can be done for laboratory tests, which can make a diagnosis of encephalitis, meningitis, subarachnoid hemorrhage and other diseases. After a lumbar puncture, it is important to rest and avoid strenuous exercise as well as heavy physical labor. Lumbar puncture is a kind of invasive operation, it is recommended that patients go to regular hospitals to carry out puncture treatment in accordance with the aseptic operation surgical norms.