Graphene　oxide　(GO)　nanosheets　were　dispersed　into　premixed　powders　(Cu-0.4　wt％　Al/35W5Cr)　by　wet　grinding　and　vacuum　freeze-drying　process.The　0.3　wt％　GO/AI2O3-Cu/35W5Cr　and　0.5　wt％GO/Al2O3-Cu/35W5Cr　composites,used　for　electrical　contacts,were　fabricated　by　vacuum　hot-pressing　sintering.The　microstructure　was　analyzed　by　field　emission　scanning　electron　and　transmission　electron　microscopy.In　addition,the　Raman　spectroscopy　and　X-ray　photoelectron　spectroscopy　were　used　to　investigate　the　structural　changes　of　GO　before　and　after　sintering.The　arc　erosion　behavior　was　investigated　by　the　JF04C　electrical　contact　testing　apparatus.Consequently,the　Al2O3　nanoparticles　were　evenly　dispersed　in　the　matrix,causing　dislocation　tangles.GO　was　converted　to　reduced　graphene　oxide　after　sintering.A　group　of　carbon　atoms　combined　with　Cr　forming　Cr3C2　in　situ　during　sintering,which　enhanced　the　interface　bonding.Compared　with　the　Al2O3-Cu/35W5Cr　composite,the　tensile　strength　of　the　two　contact　materials　containing　0.3　wt％　GO　and　0.5　wt％　GO　was　increased　by　45％　and　34％,respectively.Finally,pips　and　craters　were　present　on　the　anode　and　cathode　surfaces,respectively.Tungsten　has　undergone　re-sintering　during　arcing　and　formed　needle-like　structures.Compared　with　Al2O3-Cu/35W5Cr,the　GO/Al2O3-Cu35W5Cr　composites　have　better　welding　resistance.The　final　mass　transfer　direction　of　the　two　composites　was　from　the　cathode　to　anode.