MMP9 and hypertensive disorder: The aim of this clinical research is to explore the relationship between Buyi Huayu Pinggan Zishen recipe and valsartan in the treatment of hypertension and observe and analyze the changes in blood pressure level, some indexes of 24-hour ambulatory blood pressure, MMP-9, Ang II, MCP-1, and TCM syndrome scores, in order to further evaluate its antihypertensive effect and explore its antihypertensive mechanism.