Aim To study the clinical practical value of region-al cerebral blood flow(rCBF)spect for amaurosis fu-gax(AF).Methods 20 normal persons and 42 AF Patients were examined by rCBF spect.and compared with X-ray CT at the same time.followed up for 24(18-32)months and checked again by rCBF spect.Results The T/NT of visual area in occipital lobe of AF Patients' rCBF spect was more lower than con-trol group.the sensitivity and accurate late of AF patients' rCBF spect was more higher than CT,the AF patients' prognosis of normal rCBF spect was best and the rCBF spect had close relation with clinical prognosis observation(90.5%).Conclusion rCBF spect played an important clinical role on diagnosing,pledicting prognosis and following up with AF patients.