Abstract: The forming principle of Inconel 718 alloy formed by selective laser melting(SLM)was briefly described, and the forming mechanism of common defects such as residual stress, Nb element segregation of SLM formed Inconel 718 alloy and the research status of hot isostatic pressing, heat treatment for its control were introduced. The influence of the heat treatment process of solid solution+double aging, homogenization+solid solution+double aging on the defects, microstructure, mechanical properties and corrosion resistance of SLM formed Inconel 718 alloy were summarized. The study of heat treatment process, heat treatment process parameters and corrosion resistance of Inconel 718 alloy formed by SLM was prospected.