This　article　focuses　on　investigating　the　effect　of　printing　direction　on　the　mechanical　properties　of　Cu-10Sn　alloys　prepared　by　laser　powder　bed　fusion　(LPBF)　technology.　Specimens　with　different　forming　angles　(0　degrees,　15　degrees,　30　degrees,　45　degrees,　60　degrees,　75　degrees,　and　90　degrees)　were　fabricated　using　LPBF　technology,　and　their　mechanical　properties　were　systematically　tested.　During　the　testing　process,　we　used　an　Instron　5985　electronic　universal　material　testing　machine　to　accurately　evaluate　the　mechanical　properties　of　the　material　at　a　constant　strain　rate　of　10-3/s.　The　experimental　results　showed　that　the　mechanical　properties　of　the　specimens　were　the　best　when　the　test　direction　was　perpendicular　to　the　growth　direction　(i.e.,　the　0　degrees　direction).　As　the　angle　between　the　test　direction　and　the　growth　direction　increased,　the　mechanical　properties　of　the　material　exhibited　a　trend　of　first　decreasing,　then　increasing,　and　then　decreasing　again,　which　was　consistent　with　the　direction　of　the　microtexture　of　the　specimens.　The　root　cause　of　this　trend　lies　in　the　significant　change　in　the　stress　direction　borne　by　the　columnar　crystals　under　different　load　directions.　Specifically,　as　the　load　direction　gradually　transitions　from　being　parallel　to　the　columnar　crystals　to　perpendicular　to　them,　the　stress　direction　of　the　columnar　crystals　also　shifts　from　the　radial　direction　to　the　axial　direction.　Due　to　the　differences　in　the　number　and　strength　of　grain　boundaries　in　different　stress　directions,　this　directly　leads　to　changes　in　mechanical　properties.　In　particular,　when　the　specimen　is　loaded　in　the　radial　direction　of　the　columnar　crystals,　the　grain　boundary　density　is　higher,　and　these　grain　boundaries　provide　greater　resistance　during　dislocation　migration,　thus　significantly　hindering　tensile　deformation　and　enabling　the　material　to　exhibit　superior　tensile　properties.　Among　all　the　tested　angles,　the　laser　powder　bed　fusion　specimen　with　a　forming　angle　of　0　degrees　exhibited　the　best　mechanical　properties,　with　a　tensile　strength　of　723　MPa,　a　yield　strength　of　386　MPa,　and　an　elongation　of　33%.　In　contrast,　the　specimen　with　a　forming　angle　of　90　degrees　performed　the　worst　in　terms　of　tensile　properties.　These　findings　provide　important　insights　for　us　to　deeply　understand　the　mechanical　properties　of　Cu-10Sn　alloys　prepared　by　LPBF.