A total of 560 patients with primary hypertension were divided into two groups.Of them,260 were treated with Fosinopril(10~20 mg once daily),and the other 300 were treated with Amlodipine (5~10 mg once daily).The treatment lasted for 12 months in both groups.The levels of blood pressure (BP)、braehial ankle pulse wave velocity(baPWV)and pulse pressure(PP)were examined at baseline,6 month and 12 month with automatic analysis system of arteriosclerosis.BP in Amlodipine group(132/76 mm Hg)decreased more significantly than Fosinopril group(136/85 mm Hg),but Fosinopril group showed more remarkable changes in baPWV(1310 cm/s)and PP(52 mm Hg)than Amlodipine group(1400 cm/s and 56 mm Hg).