Al-Cu alloys are widely used in automotive and aerospace applications due to their low density, good heat resistance and potential high-temperature stability. To improve the heat resistance of Al-Cu casting alloys, an alloy with a mass fraction of Al-4%Cu-0.5%Mn-0.1%Fe-0.4%Ag-0.3%Zr (AC) was prepared. The microscopic morphology and chemical composition of the alloy were analysed by OM and SEM, the phase structure was analysed by XRD, the grain morphology and size distribution were investigated by EBSD, the microstructural details and precipitated phases after aging treatment were analysed by TEM, and the mechanical properties at room temperature and high temperature were tested by a tensile testing machine. The results show that the intermetallic compounds that formed during the casting process of the AC alloy include Al 2 Cu and Al 7 Cu 2 Fe. The Al 2 Cu phase dissolves into the matrix after solid solution treatment and reprecipitates as the θ′ phase after aging treatment, acting as the main strengthening phase. After T6 heat treatment, the alloy also contains the T Mn (Al 20 Cu 2 Mn 3 ) phase. Moreover, Ag dissolves in the Al matrix, and the addition of Zr leads to the precipitation of the L1 2 -Al 3 Zr nanophase, which coincides with the location of the θ′ precipitated phase. The tensile properties of the alloys were tested at room and high temperatures (200, 300 and 400 ℃), and the yield strengths are 236, 155, 129 and 61 MPa, respectively.