The extreme service parts represented by aerospace have harsh working environment

complex structure and integrated functions. Multi-material additive manufacturing (MMAM) can meet the macro performance customization and structure function integration in special areas

and has great application potential in nuclear

military

aviation and medical fields. The main factors that influence the interface bonding strength of MMAM technology and the methods to eliminate the defects are introduced. The different powder-feeding methods of MMAM technology and the advantages and disadvantages of each powder-feeding method are introduced. The influence of process parameters on MMAM technology is described. Finally

the current bottleneck problems of MMAM technology are summarized

and the main research directions in the future are prospected.