1) Pharmacokinetics Studies of Azilsartan with Single-dose oral administration: 24 healthy subjects will be randomly divided into 2 groups evenly, Group I and Group II, with 12 subjects in each group, half are male and half are female. Group I will take Azilsartan tablet 20mg orally on fasting, while Group II will take Azilsartan tablet 40mg orally on fasting. Blood sampling time: 0h (before administration starting), 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12, 16, 24, 36, 48h after administration. 5ml whole blood from cubital vein will be placed in a heparinized tube and centrifuged. Duplicated plasma A and B will be taken and kept in low temperature.