Study on the technology of selective laser melting (SLM) is carried out on Dimetal-280 system with 200 W fiber laser. Orthogonal experiment of six factors and five levels is designed to optimize parameters for 316L stainless steel powder. Six typical surface profiles are summarized,and the relative density and dimensional accuracy along z-direction are measured correspondingly. Results show that the density of samples is high when powders are fully melted and low when partially melted. Practical manufacturing layer trends thicker,which affects the dimensional accuracy. Considering the comprehensive effects of surface profile,relative density and dimensional accuracy,optimal parameters are obtained. Special specimen with sharp-angled and overhang features for geometrical performance test is manufactured. The relative density,dimensional accuracy and surface roughness Rz are 89%,96.8% and 25 μm respectively,which show a good result.