Left temporal pole arachnoid cyst, the location is relatively good, because at the temporal pole, there are fewer blood vessels and nerves, the operation is safer and simpler. The general steps of the surgery are as follows: choose the left frontotemporal region, arc incision, then cut the scalp and temporal muscle, expose the bone of the frontotemporal bone, drill holes in the zygomatic eminence of the frontal bone, use a milling cutter to mill open the frontotemporal bone flap, and then bite the pterionic crest, after suspending the dura mater all around, along the pterionic crest, arc shear off the dura mater. The temporal lobe is retracted with a brain compression plate and probed toward the temporal pole to expose the arachnoid cyst. During surgery, the cyst wall should be removed as much as possible, not just simply releasing the cystic fluid, or the cyst will readily recur. Surgery should open the cyst and communicate with the subarachnoid space, so that the cystic fluid can participate in the circulation of cerebrospinal fluid and minimize the recurrence of the cyst.