Clinical Efficacy of External Counterpulse Therapy and the effect on Vascular Endothelial Function in Patients with Primary Hypertension: an explorative randomized, double blinded, controlled pilot st

INTERVENTION: A:standard medical therapy+acupoint‐EECP;B:standard medical therapy; CONDITION: Primary Hypertension PRIMARY OUTCOME: vascular endothelial growth factor indicators;24 Hour Ambulatory Blood Pressure Monitoring;The change of mean SBP and DBP at the end of interventiona compares to the baseline.; SECONDARY OUTCOME: Serum Biochemical Indicators;carotid‐femoral pulse wave velocity; INCLUSION CRITERIA: 1. Age 35‐80 (including 35 and 80), gender is not limited 2. According to the Chinese Guidelines for the Prevention of Hypertension (Revised 2018),Patients diagnosed with primary hypertension levels 1‐2 3. Understand and sign informed consent form Note: The above three items must be met at the same time before they can be included in the study.