In　order　to　reduce　the　production　cost　of　copper　alloy　3D　printing,　we　use　the　Cu-10Sn　alloy　powder　prepared　by　water　atomization　as　raw　material　for　laser　selective　melting　(SLM)　experiment,　in　order　to　obtain　an　almost　completely　dense　Cu-10Sn　alloy　bulk　sample　by　optimizing　the　SLM　processing　parameters.　The　relative　density　of　the　sample　could　be　reached　to　99.　7%.　The　sample　consists　of　two　phases　of　intermetallic　compound　Cut,　Sne　and　alpha-Cu　solid　solution.　The　grain　morphology　is　mainly　the　columnar　dendrite　and　interdendritic　phases　formed　along　the　solidification　direction,　and　high　density　dislocations　arc　distributed　within　the　crystals.　Under　the　quasi-static　tensile　condition,　the　yield　strength　of　the　specimen　is　(392　6)　MPa,　the　tensile　strength　is　(799　5)　MPa,　and　the　plastic　deformation　is　29%　2.　3%.　The　comprehensive　mechanical　properties　arc　much　higher　than　those　of　Cu-10Sn　alloys　prepared　by　casting　methods.