Graphene　nanosheets(GNs)/carbon　foam　composites　were　prepared　by　direct　pyrolysis　of　GNs/cyanate　ester　(CE)　resin　mixtures　at　ambient　pressure.　Pyrolysis　behaviors　of　the　GNs/CE　resin　mixtures　were　studied　using　thermogravimetric　analysis　(TGA)　and　Fourier　transform　infrared　spectroscopy　(FTIR).　In　addition,　the　effects　of　the　additive　amount　of　GNs　on　the　microstructures,　physical　properties　and　compressive　behaviors　of　the　resulting　GNs/carbon　foam　composites　were　investigated.　Results　show　that　the　additive　amount　of　GNs　has　great　effect　on　the　thermal　stability　of　the　CE　resin　as　well　as　the　structures　and　properties　of　the　resulting　composites.　With　the　increasing　of　additive　amount　of　GNs　from　0　to　6　wt.%,　the　composite　exhibits　an　increase　in　the　bulk　density　and　mechanical　performance　as　well　as　structural　uniformity.　When　the　additive　amount　is　6　wt.%,　its　bulk　density,　compressive　strength　and　modulus　arrive　at　0.38　g/cm3,　7.11　MPa　and　115.9　MPa,　respectively.　©　2015　Elsevier　B.V.　All　rights　reserved.