Abstract: 2319 aluminum alloy components were printed by CMT arc additive manufactured technology. The effects of solution treatment on the microstructure and mechanical properties of aluminum alloy were studied by differential scanning calorimetry（DSC）, optical microscope（OM）, scanning electron microscope（SEM） and universal tensile testing machine. The results show that the overburnt temperature of the alloy is about 550.5 ℃, with the increase of the solution temperature, the tensile strength first increases and then decreases. Once the solution temperature exceeds the overburnt temperature, the elongation decreases rapidly. With the increase of solution time, the tensile strength and elongation increase gradually. Under the solution condition of 540℃/5h, the tensile strength of the alloy after T6 aging state is 499 MPa, the extension rate is17.52%. Compared with the deposited state, the tensile strength of the alloy is increased by about 114%, and the extension decreases by about 14%.