Purpose: To investigate the effects of changing body temperature on mean cerebral blood flow velocity by using Transcranial doppler. Material and methods: This study included in 30 rats separated 3 groups (normothermia, hypothermia and hyperthermia) after exposing to experimental subaracnoid hemorrhage model. The mean blood flow velocities of all groups were recorded by using Transcranial doppler first, 30th, 60., 120., 240., 360 minutes after procedure. Results: While the mean blood flow velocities of whole rats reduced in the 1st minutes after SAK, pulsatility index increased. In the hypothermia groups, mBFv did not show increasing during the experiment. In the contrast, normothermia and hyperthermia tended to higher than hypothermia, significantly. Conclusion: Hypothermia can prevent luxury perfusion in the early time of SAK. Hyperthermia also can be worst prognostic value.