Abstract: Traumatic brain injury(TBI)is the damage of brain tissue caused by external injuries and it has a higher incidence of incidence rate and death rate. It is difficult to diagnose TBI with classic medical imaging technology. PET is an imaging technology that can measure the cerebral glycometabolism and cerebral blood flow quantitatively. It can display the brain functional change caused by TBI. Currently, ¹⁸F-FDG PET imaging can diagnose TBI by evaluating the cerebral glycometabolism and cerebral blood flow variation. This paper has comprehensively discussed the current conditions of ¹⁸F-FDG PET imaging and cerebral blood flow perfusion PET imaging.