As a new perfusion imaging technique, the arterial spin labeling (ASL)technique is able to measure perfusion images noninvasively.This paper explains the quantization principle of muitidelay ASL, and then analyzes the advantages in practical application in comparison to positron emission computed tomography (PET) and computed tomography (CT).At last, the clinical research contents and research prospect of multidelay ASL technology are summarized. The application of multidelay ASL technology in the research of cerebrovascular diseases is also discussed. It is pointed out that multidelay ASL technology has great potential for the prevention and treatment of cerebrovascular diseases.