For the problem of lower performance of supercapacitors based on activated carbon，according to aworking principle of an electric double layer capacitor，activated carbon electrodes with mass fractions of 60%，65%，70%，75% and 80% were prepared by a powder compression technology. Activated carbon，acetyleneblack，PTFE with the mass fraction of 15% and isopropanol were used as raw materials. The specific capacitance，the specific energy and the specific power of the activated carbon electrodes were analyzed through cyclicvoltammetry tests with scanning rates at 5 mV/s，10 mV/s，20 mV/s，50 mV/s，100 mV/s and 200 mV/s. Theresults show that the specific capacitance is 189. 3 F /g and the specific energy is 26. 3 W·h /kg when the massfraction of activated carbon is 70% and the scanning rate is 5 mV/s. The specific power is 916. 6 W/kg when themass fraction of activated carbon is 70% and the scanning rate is 20 mV/s. This study confirms the optimal ratio ofthe mass fraction of activated carbon is 70%，providing an important reference for preparation of supercapacitorsbased on activated carbon electrodes.