Objective: To research the significance of differen t intensitie s of electroacupuncture (EA) in the regulation of blood pressure. Methods: A tot al of 44 cases of excess-syndrome type hypertension patients were divided by randomizing into high-intensity EA group (n=21) and medium -intensi ty EA group (n=23) . Bilateral Quchi (LI 11) and Taichong (LR 3) were punctured and stimulated with the same continuous waveform

same frequency (70 pulses/min)

and different ele c tric current intensities:3.7 mA (high intensity) and 2.7 mA (medium intensity). EA treatment w as given to the patients with double blind method. Results: T he sensation thres hold and pain threshold of high-intensity EA and medium-intensity EA groups w ere 1.50±0.29 mA and 1.52±0.33 mA

3.93±0.47 mA and 3.89±0.43 mA respect ively. Following high-intensity EA stimulation

the systolic and diastolic blood press ur e values increased from 22.0±1.8 kPa and 11.9±0.3 kPa to 26.2±1.6 kPa ( P< 0.0 1) and 12.0±0.7 kPa separately; while after medium-intensity EA stimulation

th e systolic and diastolic blood pressure values declined significantly from 22.3 ±1.6 kPa and 11.9±0.8 kPa to 20.7± 1.4 kPa(P<0.01)and 11 .3±0.7 kPa( P<0.01)respectiv ely. Conclusion: The electric current intensity of EA plays an important role in the regu lation of blood pressure. The high-intensity EA may raise blood pressure while t he medium-intensity EA has the effect of lowering blood pressure and the later is suitable to treat excess-syndrome type hypertension patients.