This is a large scale, open-label, multicenter, randomized controlled clinical trial with four parallel arms. This trial aims to evaluate the effectiveness of affected meridian acupuncture for patients with mild hypertension,with respect to decreasing their blood pressure, safety of acupuncture ,and improving their quality of life as well.

Investigators plan to recruit 428 hypertensive patients. Eligible patients will be randomized to four different groups.ⅰ. the affected meridian acupuncture group (AMA, n=107) will be treated with acupoints on affected meridians.ⅱ.the non-affected meridian acupuncture group (NMA, n=107) will be treated with acupoints on non-affected meridians.ⅲ.invasive sham acupuncture group(ISA, n=107)will be provided with sham acupoints treatment.ⅳ.waiting-list group(WL, n=107)will not be given any intervention.

Inclusion Criteria：

1. Patients whose age between 40 and 75 years old, male and female;
2. Patients who meet the diagnostic criteria of mild hypertension according to JNC-7 and China's prevention and cure guide of hypertension. mild hypertension (WHO/ISH criteria stage I) Systolic blood pressure 159≥(SBP) ≥140 and/or diastolic blood pressure 99≥(DBP) ≥90 .
3. Patients who are initially diagnosed as mild hypertension or have been diagnosed as mild hypertension before but have not taken any antihypertensive drugs.
4. Patients who are diagnosed as yue-yin style (yin-deficiency accompany with hyperactivity of yang) or yang-ming style (obstruction of phlegm and dampness) according to meridian syndrome differentiation
5. Patients who have a good understanding of our study. and willing to comply with our study protocol.
6. Informed consent form must be signed by patient or lineal relative.
7. All the tips are matched will be included.

Exclusion Criteria:

1. Patients who have been diagnosed as secondary hypertension or malignant hypertension(e.g. Cushing's syndrome, coarctation of the aorta，phaeochromocytoma, renal parenchymal disease，primary aldosteronism， renovascular hypertension, obstructive sleep apnoea，drug induced hypertension et al )
2. Patients who accompany with other severe medical conditions (e.g. endocrine disorders, cardiovascular disease. Digestive disease. hepatic dysfunction，cerebral vascular disease. renal disease. haematologic disease et al). Who may be not safe to join our study.
3. Patients with a chronic disease which might not suitable for our study. e.g: epilepsy ,severe depression or anxiety (SAS≥70,SDS≥70) ,psychosis, allergic constitution, accompany with any infection.
4. Pregnant women or women in lactation or women of child bearing potential plan to conceive in the recent six months.
5. Patients who currently participate in another clinical trial.
6. Patients who Had been treated with acupuncture during the previous three months
7. If one of the tips mentioned above is matched will be excluded.