<p>Laser deposition repairing technology (LDR) has the characteristics of low heat input and good mechanical performance, which can be used to repair the damaged alloy parts, effectively improving the utilization rate of resources and reduce costs. In this paper, the LDR technique was used to repair WE43 alloy, and the microstructure and mechanical properties of the repaired specimens were analyzed. The results show that the microstructure of the repaired zone consists of α-Mg phase and precipitated Mg₂₄Y₅ and Mg₄₁Nd₅ phases. The average microhardness of the repaired zone is about 89.9 HV_0.1, which is 34.9% higher than that of the substrate zone. The average tensile strength of the repaired specimens is 220.4&#xa0;MPa, which achieved 92% of the properties of the substrate. The fracture location occurs in the repaired zone due to the porosity defect. The fracture mechanism of the repaired specimens is brittle fracture.</p>