Abstract: 316L stainless steel is widely used in various industrial fields, but its strength is low, so improving its strength has become a research hotspot. The 2 wt% and 4 wt% nano-TiC particles were added to 316L, and the composite powders were prepared by ball milling. The composite sample was formed by SLM. By adjusting the process parameters of ball milling and SLM, the composite sample with uniform Ti C distribution, firm bonding with matrix and nearly full density were obtained. It is found that with the addition of Ti C, the average grain size decreases significantly and the grain is refined. The mechanical properties test（tensile test, hardness test, friction and wear test） of the sample are comprehensively studied. With the addition of Ti C, the strength, hardness and wear resistance of the sample are greatly improved. The tensile strength and elongation of 2 wt%Ti C/316L formed by SLM are 948 MPa and 36.01% respectively, which are 42.6% and 79.7% higher than those of 316L formed by SLM, indicating that the strength and plasticity of 2 wt%TiC/316L can be improved simultaneously. The results can provide a method for SLM particle reinforced metal base composite to enhance the strength and plasticity.