The eligible patients will be randomly divided into the following groups at a 1:1:1:1:1 ratio : Shenyankangfu tablets group , losartan potassium 50 mg group , losartan potassium 100 mg group , Shenyankangfu tablets + losartan potassium 50 mg group , and Shenyankangfu tablets + losartan potassium 100 mg group .