We demonstrate a novel wireless intracranial pressure (ICP) monitoring system based on air pressure sensing. This system consists of an implantable ICP monitoring device, a wireless ICP data recorder and a data display software. The ICP monitoring device is implanted outside the skull and under the scalp while an air-pouch is inserted into the cranial space to measure the ICP value. The measured pressure value is transmitted to the wireless data recorder outside the body in the 416 MHz band. The real-time ICP values are transmitted to the display software for history data reviewing, storage and further processing. This system can be attractive in two ways: 1) high ICP measuring resolution and accuracy, 2) low damage to brain tissues compared to the conventional implantable wireless ICP systems.