Metal additive manufacturing technology has great advantages over traditional manufacturing technology and has been applied in many fields.Based on the research status of metal additive manufacturing process,materials and structures,the current research hotspots and development trends were analyzed.The results show that the current research hotspots of metal additive manufacturing are material application,simulation,intelligent detection and heat treatment strengthening,and there is no uniform standard for quality assessment.The future development trend of metal additive manufacturing is to establish standard material process database,multi-material printing process research and development,simulation optimization,intelligent monitoring management and heat treatment strengthening process research and development.