Al-Cu alloys have important applications in the transportation field due to their high strength, hardness, and high-temperature mechanical properties. To clarify the mechanical characteristics of Al alloy with high Cu content, rheo-diecast Al-15Cu alloy was investigated to determine the influence of factors such as pouring temperature on the mechanical properties of rheo-diecast parts. The results show that with increasing casting temperature, the average equivalent diameter of the primary α-Al grains decreases from 55 μm to 30 μm, while no apparent change is shown in the average shape factor with respect to the casting temperature. The application of electromagnetic stirring has some effect on the refinement of the primary α-Al grains. The strength and elongation of the rheo-diecast Al-15Cu alloy parts increase and then decrease with increasing casting temperature. The density, tensile strength and elongation of the tensile specimens with a pouring temperature of 610 ℃ and electromagnetic stirring reach the highest values, which are 2.961 g/cm 3 , 260 MPa and 2%, respectively. At 300 ℃, the variation in the tensile properties of the rheo-diecast alloy with increasing pouring temperature is consistent with that at room temperature, and the highest tensile strength and elongation reach 118 MPa and 8%, respectively.