Objective : To investigate the effects of Acupuncture therapy on the migraineur by way of the change of the Cerebral blood flow. Methods : 6 migraineurs were inserted in acupoints on GV16, G20, S8 during 2 weeks. and, Mean Velocity (MV) and Pulsatility Index (PI) of MCA, PCA, ACA, BA were measured before and after treatments of 2 weeks, respectively. Results : MV of MCA of the migraineurs was decreased very much by 13.3%, and PI was decreased much by 10.4%. However, MV and PI of BA changed little. Conclusion : It is observed that Acupuncture therapy reduces pains of migraineur through decreasing Cerebral blood flow like MCA.