Selective　Laser　Sintering　(SLS)　is　a　fast　developing　technology　of　Rapid　Manufacturing　(RM).　In　some　case　vertical　sintering　using　laser　to　repair　big　part　in　work　site　is　inevitable.　In　this　paper,　an　approach　of　laser　vertical　sintering　with　magnetic　field　has　been　explored.　The　powder　was　paved　on　a　substrate　with　magnetic　field.　The　laser　beam　scanned　the　part　with　different　strategies　on　the　vertical　plane.　Under　the　control　of　magnetic　field　a　tight　part　with　specific　thickness　and　shape　could　be　made.　During　the　entire　operation　the　powder　can　be　controlled　easily　and　a　clean　workplace　can　be　achieved.　With　the　effect　of　the　magnetic　field,　the　sintered　tropism　and　density　of　the　powder　differ　from　conventional　method.　The　magnetic　field　can　help　to　improve　the　quality　of　crystallization　during　sintering/melting.　To　some　extent,　using　laser　beam　to　sinter　powder　vertically　has　an　obvious　advantage　of　its　process　mechanism,　which　has　great　potential　in　industrial　applications.