The　author　describes　the　result　of　an　experiment　which　illustrates　the　effect　of　laser　beam　incident　angle　on　laser　cutting　quality.　The　experiment　shows　the　possibility　to　get　a　satisfying　cutting　quality　with　the　non-vertical　laser　beam　to　work　piece　surface.　This　is　quite　different　from　the　traditional　ideas　in　which　the　laser　beam　must　be　vertical　to　work　piece　surface　for　laser　cutting.　In　three　dimensional　laser　cutting　author　gives　the　way　to　obtain　good　cutting　quality　when　the　laser　beam　is　not　vertical　to　work　piece　surface.