Abstract：To obtain electrode materials with high performance of supercapacitor, porous graphite carbon with high nitrogen level (NPGC) was prepared via a novel aggregation-NaOH activation route, in which low-cost kelp and melamine severed as carbon and nitrogen source, respectively. The as-prepared samples were characterized by XRD, BET, Raman and XPS. The results showed that the resulting NPGC with a lamellar structure displayed a large surface area of 1771 m2/g and a high graphite degree (ID/IG:2.84) and possessed a high nitrogen content of 6.27at%. In addition, the electrochemical properties of the samples were examined using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). As a result, the specific capacitance of the NPGC material reached up to 267 F/g at 1 A/g. Furthermore, the specific capacitance of the sample was still 99.9% of the initial specific capacitance after 5000 cycles. Thus, the synthesized material had excellent energy storage properties.