Abstract: In studying head impact injuries during emergency ejection, to examine the mechanism and protection of brain injuries, 24 monkeys underwent head impact of various intensities (1.9￣3.0kN ) by means of a dynamic loader. The relationship between degree of head injury and intracranial pressure was analyzed. The results indicated that intracranial pressure increased with serious degrees of head injuries. It was also observed that dynamic response curves of intracranial pressure were different in different degrees of head injuries.6.63kPa increment of intracranial pressure caused concussion of brain in monkeys. Increment of intracranial pressure threatening monkey's life was 10.02kPa and above. Head impact injuries could be prevented by fixing the head or avoiding the out of shape of skull in emergency ejection. The experimental results could provide reference material for the diagnosis and treatment and protention of head impact injury.

Key words: head, impact load, windblast, monkey, int racr anial pr essur e, brain injuries