A　systematic　study　on　the　three　dimensional　(3D)　prototyping　of　cobalt-chromium　alloys　are　carried　out　by　using　a　self-developed　laser　melting　equipment.　The　optimizations　of　properties　which　involve　the　surface　roughness,　surface　morphology,　relative　density,　hardness　of　the　workpieces　are　further　discussed.　Results　show　that　melting　shrinkage　and　thickness　accumulation　of　the　powder　layer　are　two　important　factors　to　affect　the　forming　quality;　the　smaller　of　the　surface　roughness　cumulative　effect,　the　less　pore　are　observed,　which　lead　to　a　high　relative　density;　Furthermore,　macro-hardness　of　the　part　has　a　significant　dependence　on　relative　density.　The　relative　density　of　98.04%　and　the　macro-hardness　of　40HRC　under　the　optical　process　parameters　are　obtained,　conforming　to　American　society　of　testing　materials　(ASTM)　standards.　©　2015,　Chinese　Laser　Press.　All　right　reserved.