The　fabrication　of　graphene/metal　matrix　composites　by　selective　laser　sintering　(SLS)　technique　has　been　extensively　studied;　however,　the　complex　microstructure　and　residual　stress　limit　their　further　applications.　Herein,　the　sintering　behavior　of　graphene/aluminum　(Gr/Al)　composites　is　studied　using　an　all-atom　model.　The　effect　of　sintering　temperature　and　Al　particle　size　on　densification　is　investigated　based　on　molecular　dynamics　(MD)　simulations.　The　results　reveal　that　the　higher　sintering　temperature　and　smaller　particle　size　are　conducive　to　the　improved　sintering　quality　of　Gr/Al　composites.　Then,　a　large-scale　laser　sintering　model　of　Gr/Al　composites　is　established　and　the　sintering　process　is　simulated　using　optimal　sintering　parameters.　The　evolution　of　microstructure　and　residual　stress　of　Gr/Al　composites　during　SLS　are　investigated　in　detail.　The　results　indicate　that　the　epitaxial　growth　of　Al　grains　plays　a　dominant　role　in　grain　growth,　promoting　the　formation　of　nanoscale　single　crystals.　Therefore,　stress　concentration　occurs　at　the　voids,　microcracks　and　Gr/Al　interfaces,　but　not　at　the　stacking　faults.　What＇s　more,　the　distribution　characteristics　of　residual　stress　components　in　Gr/Al　composites　are　affected　by　Gr/Al　interaction.