The maximum velocity(Vmax) and end-diastolic velocity(Ved) of the anterior cerebral arteries(ACA) and the peak flow velocity of the ascending aorta (PFVAO) in 24 normal-termed newborns were serially measured on the 1st,2nd,3rd and 7th day of life by the use of two dimensional pulsed doppler echocardiography. It was demonstrated that Vmax,Ved,Vmax/PFVAO,and Ved/PFVAO increased with the increae of age. Mean values increased respectively from 28.0 to 43.4 cm/s,10.6 to 16,8 cm/s,0.40 to 0.62 and.16 to.24 in the first 7 days after birth.the PFVAO and pulsatility indices(PI) in ACA remained were stable,mean values were 68~71 cm/s and 0.6 respectively.