In order to obtain the process parameters of selected laser melting (SLM) 316L stainless steel suitable for grinding, an orthogonal experiment with three factors and four levels was designed. On this basis, the experimental data of the performance index density, microhardness and surface roughness after grinding were obtained, and the main and secondary effects of SLM process parameters on the performance index were obtained by range analysis method. Based on grey correlation theory, the experimental data were simplified by multiple indexes to obtain the quantified value-correlation degree, which can evaluate the comprehensive performance of the sample. The regression equation of process parameters and correlation degree was obtained by fitting regression method. The fitting degree of the equation reached 91.32%, indicating that the equation has high reliability. Using Minitab to optimize the regression equation, the optimal process parameters suitable for grinding were obtained as follows: laser power 270 W, scanning speed 707 mm/s, scanning spacing 0.14 mm, The density was 98.78%, the microhardness was 265.46 HV, and the surface roughness was 0.66 μm.