Percutaneous Transluminal Agioplasty(PTA) is an effective initial treatment modality in renovascular hypertension. For determination of PTA effect, the pulse pressure recording of renal artery is not simple as compared within femoral artery stenosis. We tried to evaluate the PTA effect of renal artery stenosis with tracing the pressure of distal renal artery. We used the cardian catheterization apparatus(VR-12 Honeywell) as a pressure monitor in two cases of focal renal arterial stenosis. The renal artery pressure was doubled after first attempt of ballooning , and the rpressure elevated up to 94 % and 79% of aorta pressure in two cases, respectively, after third attempt. We believe that renal artery pressure monitoring is a good method of determination of PTA effect in renovascular hypertension.