Abstract: Based on the analysis of the element loss behavior of the memory alloy in the additive manufacturing process, a series of FeMnSiCrNi alloys with different Mn and Si contents were prepared by arc melting deposition using self-made powder cored wire as raw material. The burning loss ratios of Mn and Si elements is solved, and the mathematical model of the relationship between the burning loss ratio and the design content is fitted. The model is verified by melting deposition experiments. The results show that the main form of element burning loss of additive manufacturing memory alloy is the selective evaporation of low boiling point elements, and its absolute burning loss ratio is approximately linear with the design composition of all burnable elements in the alloy. Meanwhile, the verification experiment results show that the error of the composition of the memory alloy obtained by the model design is not more than 4%, which indicates that the theoretical model has high accuracy and can be used to guide the accurate control of the composition of the memory alloy in the additive manufacturing.