Aim To explore the relationship between blood pressure and carotid haemodynamics in normotensive carotid stenosis patients by color duplex ultrasonography. Methods The 80 mortotensive carotid stenosis patients were checked for the blood pressure and carotid haemodynamics indexes,including systolic blood pressure(SBP),diastolic blood pressure(DBP) and the haemodynamics premeters of blilateral carotid arteries. Results The stenosis grades would accelerate blood velocity of the stenosis internal carotid artery.The vertebral artery blood flow velocity were faster in SBP of 90 to 120 mmHg and DBP of 60 to 79 mmHg,while the blood flow resistance was smaller in the same blood pressure level.Then the vertebral artery blood flow velocity would go down and the blood flow resistanc would raise,with the increase of blood pressure especially SBP of >120 mmHg,DBP of ≥80 mmHg. Conclusion Lowering blood pressure could help promoting the carotid blood flow velocity and increasing cerebral blood flow.And SBP of 90 to 120 mmHg and DBP of 60 to 79 mmHg may help maintaining the better cerebral haemodynamics.