Abstract: The vertical stacking behavior of metal micro droplet was studied to explore the vertical stacking and spreading morphology of metal micro droplet under different forming process parameters. The method of finite element simulation and experimental verification was used to reveal the metal droplet vertical under large temperature gradient and small forming space The results showed that heating temperature, distance between substrate and nozzle, scanning speed, scanning path and other technological parameters will have a great impact on the surface accuracy and internal quality of the formed parts in the vertical stacking process of metal micro droplet. Therefore, the research on the matching of the technology is of great theoretical and practical significance for improving the precision and quality of 3D printing parts with metal droplet stacking.