A　flaky　CoS2　based　reduced　graphene　oxide　(CoS2/rGO)　composite　was　successfully　synthesized　via　a　solvothermal　route.　CoS2　nanoparticles　with　sizes　of　20-30　nm　are　uniformly　anchored　on　the　reduced　graphene　oxide　(rGO),　resulting　in　the　flaky　structure.　The　as-fabricated　CoS2　based　rGO　composite　exhibits　improved　sodium　storage　capacity　compared　with　bare　CoS2　as　anode　materials　for　sodium-ion　batteries.　After　cycling　for　1000　cycles　at　1　A　g(-1),　the　CoS2　based　rGO　electrode　still　delivered　a　reversible　capacity　of　192　mA　h　g(-1).　The　enhanced　electrochemical　performances　of　the　CoS2　based　rGO　composite　can　be　ascribed　to　the　formation　of　a　robust,　conductive　and　high　surface　area　composite.