In　this　study,　a　10　wt%　SiC-reinforced　AlSi10Mg-based　composites　is　prepared　by　selective　laser　melting　(SLM)　process.　The　effect　of　laser　linear　energy　density　on　phase　morphology,　microstructure,　and　mechanical　properties　of　AlSi10Mg-10SiC　composite　is　investigated.　There　is　relatively　higher　density,　no　obvious　pores　and　cracks　in　the　SLM-fabricated　AlSi10Mg-10SiC　composites　with　laser　linear　energy　densities　ranging　from　90.64　J/mm(3)　to　104.16　J/mm(3).　The　high　laser　linear　energy　density　promotes　the　in-situ　reaction　between　SiC　particle　and　Al　melt　in　the　melt　pool,　the　Al4SiC4　phase　forms　during　SLM　fabrication　process.　Driven　by　Marangoni　convection,　the　fine　SiC　particles　and　Al4SiC4　phase　distributes　uniformly.　When　the　laser　linear　energy　density　is　104.16　J/mm(3),　the　composite　exhibits　the　highest　average　micro　hardness　of　208.5　HV0.1.　When　the　laser　linear　energy　density　is　90.64　J/mm(3),　the　composite　displays　the　highest　yield　strength　and　modulus　with　values　of　408　MPa　and　90　Gpa,　respectively.　During　the　deformation　process　of　tensile　test,　the　higher　modulus　SiC　particles　could　withstand　greater　load　transfer,　which　improves　the　modulus　and　yield　strength　of　the　composites.　(C)　2021　Published　by　Elsevier　B.V.