The　powder　carbonaceous　materialJPCwas　obtained　by　pre-carbonizing　Jujun　grass　at　low　temperatureand　then　activated　with　different　proportions　of　KOH　at　different　temperaturesamorphous　carbon　material　JPCK1with　microporous　and　mesoporous　distribution　was　obtained.　The　specific　surface　area　of　the　synthesized　carbon　JPCK1-900-4X　is　up　to　3368　m2/gwith　large　pore　volume　and　0.95%atomic　percentnitrogen　content.　Electrochemical　tests　showed　that　JPCK1-900-4X　has　good　energy　storage　potential　in　supercapacitor　applications.　When　the　current　density　is　0.5　A/gthe　specific　capacitance　is　311.7　F/gand　when　the　current　density　is　increased　to　10　A/gthe　specific　capacitance　is　230　F/g.　After　5000　cycles　of　charging　and　discharging　at　the　current　density　of　10　A/gthe　capacitance　retention　rate　is　97.5%which　indicates　that　it　has　good　stability.　In　the　two-electrode　systemwhen　the　power　density　is　250　W/kgthe　energy　density　can　reach　17.7　W·h/kg.　©　2023　Higher　Education　Press.　All　rights　reserved.