The main location of the lumbar pool is in the dura mater of the lumbar spine, and it is a way to do cerebrospinal fluid drainage and measure cerebrospinal fluid pressure. The patient takes the 3rd and 4th segment of the lumbar spine as a lumbar puncture while lying on the side, and connects the lumbar pool with the corresponding measuring drops and appliances into the lumbar puncture needle, which can release the cerebrospinal fluid, and can measure the cerebrospinal fluid pressure. After measuring the cerebrospinal fluid pressure, the cerebrospinal fluid can be continuously drained, which can relieve the manifestation of increased cerebrospinal fluid. Lumbar pool puncture is contraindicated in the case of high intracranial pressure to avoid brain herniation. Lumbar pool puncture is not allowed in the case of skin infection in the lumbar back, because it can easily lead to infection of the cerebrospinal fluid during the puncture process and retrograde infection to the brain. In addition, some other contraindications also do not allow lumbar pool puncture.