Activated carbon for electric double layer capacitors was prepared from bamboo by activation with KOH through heating by microwave radiation.The influence of the power of microwave radiation was studied.Its charge-discharge performance of the bamboo based AC EDLC was researched,too.It showed that the specific capacitance of bamboo based AC could reach 244.2 F/g while the ratio of KOH to bamboo was 2∶1 and the power and radiation time of microwave were 720 W and 15 minutes respectively.Moreover,it showed good stability.