An experimental study was conducted on the forming performance of 316L stainless steel samples formed by selective laser melting technology (SLM). The relationship between different parameters and the forming performance was established by using the energy density formula, and the influence of different energy densities on the density and wear resistance of the samples was investigated. The results show that when the laser energy density increases from 34.72 J/mm3 to 69.44 J/mm3, the density of the specimen increases from 91% to 99%. This is because the increase in energy density leads to an increase in the fluidity inside the molten pool. As a result, the surface tension of the metal solution decreases, and the density increases accordingly. After that, the energy density increased from 86.81 J/mm3 to 121.53 J/mm3, and the density did not change significantly; while the wear resistance of the specimen increased first and then decreased with the increase of energy density, when the energy density was 86.81 J/mm3, the sample has the best wear resistance and the highest density.