Cobalt　hydroxide　is　expecting　electrode　material　for　high-performance　supercapacitors,　however,　it　is　still　a　challenge　to　improve　its　lack　of　transmission　track　and　active　sites.　An　effective　method　to　improve　the　elec-trochemistry　performance　of　cobalt　hydroxide　is　to　couple　it　with　graphene　quantum　dots.　Herein,　we　report　the　preparation　of　Cobalt　hydroxide/N　doped　graphene　quantum　dots　(Co(OH)2/NQDs)　composites　and　study　the　electrochemistry　performance　of　Co(OH)2/NQDs　composites　as　supercapacitors　electrode　materials.　Benefit　from　the　strong　coupling　between　NQDs　and　Co(OH)2　creates　new　electron　transfer　channels　(Co-N).　The　hybrid　supercapacitor　device　based　on　Co(OH)2/NQDs　composite　and　GA　shows　a　high　energy　density　of　about　33.6　Wh　kg-1　at　a　power　density　of　800　Wk　g-1,　and　it　retains　about　137%　specific　capacitances　after　8000　cycle　test.　Due　to　the　negative　potential　of　NQDS,　it　can　generate　an　electrostatic　reaction　with　Co2+,　which　can　stabilize　cobalt　hydroxide　after　long　cycles.