Selective laser melting forming magnesium alloy components have excellent performance and high degree of individuation,which has important application significance in industrial production,biomedicine and other fields.Firstly,the basic principle and technical characteristics of selective laser melting forming magnesium alloy were briefly explained.Then,based on the research status of selective laser melting forming magnesium alloy technology at home and abroad,the existing research results and unresolved technical problems were summarized.On this basis,the key technologies of selective laser melting forming magnesium alloys were analyzed,and the main technical difficulties and their solutions were comprehensively summarized.Finally,the development trend of selective laser melting forming magnesium alloys was discussed,and further research can be carried out in the following aspects:1) optimize the existing process parameters and forming bin air duct and other mechanical dust removal structure for improving the forming quality through active dust suppression and passive dust suppression methods;2) prepare high performance magnesium alloy components by reducing forming defects through process control;3) optimize powder screening structure to improve molding safety.