A　facile,　time-saving　and　one-step　process　to　prepare　graphene-based　materials　with　excellent　comprehensive　capacitive　performance　is　very　promising　for　practical　applications.　Here,　porous　nitrogen-doped　graphene/carbon　nanotubes　composite　(PNGC)　with　loosened　structure　was　prepared　by　pyrolysis　method　and　the　porous　structure　of　PNGC　was　controlled　by　combined　action　of　urea　and　low-cost　lignosulfonate.　PNGC　is　equipped　with　porous　structure　and　thin　graphene　nanosheets,　and　meanwhile　possess　numerous　active　sites　and　high　surface　areas.　Importantly,　PNGC　exhibits　a　high　specific　capacitance　of　246.6　F　g(-1)　at　a　current　density　of　0.5　A　g(-1)　and　high　stability　of　96.5%　capacitance　retention　ratio　after　2000　cycles　at　100　mV　s(-1),　indicating　an　excellent　performance　of　PNGC.　Furthermore,　the　corresponding　mechanism　of　pore　formation　in　PNGC　is　hence　proposed.　This　work　of　obtaining　PNGC　is　of　paramount　importance　for　the　future　practical　application　of　electrode　materials　for　supercapacitor　application.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.