The　powder　carbonaceous　material　(JPC)　was　obtained　by　pre-carbonizing　Jujun　grass　at　low　temperature,　and　then　activated　with　different　proportions　of　KOH　at　different　temperatures,　amorphous　carbon　material　(JPCK1)　with　microporous　and　mesoporous　distribution　was　obtained.　The　specific　surface　area　of　the　synthesized　carbon　JPCK1-900-4X　is　up　to　3368　m(2)/g,　with　large　pore　volume　and　0.95%　(atomic　percent)　nitrogen　content.　Electrochemical　tests　showed　that　JPCK1-900-4X　has　good　energy　storage　potential　in　supercapacitor　applications.　When　the　current　density　is　0.5　A/g,　the　specific　capacitance　is　311.7　F/g,　and　when　the　current　density　is　increased　to　10　A/g,　the　specific　capacitance　is　230　F/g.　After　5000　cycles　of　charging　and　discharging　at　the　current　density　of　10　A/g,　the　capacitance　retention　rate　is　97.5%,　which　indicates　that　it　has　good　stability.　In　the　two-electrode　system,　when　the　power　density　is　250　W/kg,　the　energy　density　can　reach　17.7　W　center　dot　h/kg.