Abstract: The effect of titanium content on microstructure and mechanical properties of AlSi10Mg alloy formed by laser selective melting was studied by adjusting the amount of titanium.The results show that the addition of 3wt%Ti element increases the yield strength and tensile strength of AlSi10Mg by 15% and 8.3%, respectively.This is attributed to the solid solution strengthening of titanium in the aluminum matrix and the formation of nano Al₃Ti.The rapid solidification process increases the solid solution limit of titanium in the aluminum matrix and significantly reduces the size of Al₃Ti.Nano Al₃Ti, which is distributed within the grains and maintains a good coherent relationship with the matrix, can improve the strength while maintaining good plasticity.However, incomplete melting of titanium alloy powder can lead to a decrease in the plasticity of the material.