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Objective: To observe the effect of acupuncture of Fengchi (风池 GB 20) on blood pressure,serum IL-6 and plasma endothelin (ET) contents in patients with hypertension. Methods: Thirty cases of hypertension patients were made up of treatment group and treated with acupuncture of Fengchi (GB 20); while 20 healthy subjects were made up of control group. Blood pressure was determined before and after the treatment. Fasting blood samples were taken from the cubital venous vessel for detecting serum interleukin (IL)-6 and plasma ET contents with radioimmunoassay before and after acupuncture treatment. Results: Before the treatment, in hypertension patients, serum IL-6 and plasma ET levels were significant higher than those in healthy subjects (P ＜ 0.01 ); while after the treatment, blood pressure of treatment group declined significantly ( P ＜ 0.01 ), serum IL-6 and plasma ET levels decreased considerably ( P ＜ 0.01 ). Conclusion:Acupuncture of Fengchi (GB 20) can lower blood pressure, regulate cellular immunity and secretion functions of the vascular endothelial cells in hypertension patients.