To compare the effect of electric acupuncture(EA) at different intensities on patients with postherpetic Neuralgia(PHN).Methods： We randomly divided 91 PHN patients into three groups， treated them with EA at different intensities for 15 times. The intensities of EA of three groups were set at 1 mA，3 mA，5 mA respectively. The visual analogous scale(VAS)， emotional scale (ES)， and comprehensive curative effects of EA of the three groups were observed before and after treatment. Results： After the treatment by EA for 7 and 15 times， the VAS， ES scores and the comprehensive curative effect of 3 mA and 5 mA group were lower than those of 1 mA group (P<0.05、P<0.01)，but there were no significant differences between the 3 mA and 5 mA group(P>0.05).Conclusion： There is no better effect of intensifying the EA current in treating PHN; Current at 3 mA has the most satisfactory performance.