Multi-material parts are promising for aerospace, biomedical and automotive applications due to their multi-functionality and environmental adaptability. Selective laser melting (SLM) technology is an effective way to fabricate multi-material parts. Since the material is deposited layer-by-layer in SLM, the interface characterization of the multi-materials directly determines the performance of the part. Therefore, the work aims to study the interfacial characterization and mechanical properties of multi-materials prepared by SLM.