Niobium alloys exhibit exceptional strength and lightweight advantages in the ultra-high temperature environment. However, conventional processing techniques face challenges in fabricating intricate components. In this study, two niobium alloys, Nb52 and Nb52 – 0.1ZrC, with dense microstructure, were prepared by selective laser melting (SLM) technology. The results show that the introduction of ZrC carbides significantly improves the strength of SLMed niobium alloys, and its yield strength, tensile strength, and plastic strain in the as-printed state reach up to 745.91 MPa, 795.45 MPa, and 1.8%, respectively. Fracture behavior at room temperature exhibits a combination of intergranular fracture and transgranular fracture modes. This work broadens the forming process of niobium alloy, and provides a new research idea for improving the properties of niobium alloys and developing a new low-cost niobium alloy system.