Abstract: Different contents of titanium and boron are added in aluminium-copper alloy.At the same condition of metallurgy and hot treatment, different microstructures are obtained, which are studied by means of XRD, SEM, optical microstructures and Brinell hardness.The microstructure is α solution phrase and θ phrase (Al₂Cu) and AlCu₂Ti, Al₃Ti, TiB₂.With the solutionising temperature of 540℃, on the time of 15h, different contents of titanium and boron are added in the aluminium-copper alloy, Brinell hardness reaches the peak of 129HBS, and on the time of 24h, Brinell hardness reaches another peak of 128HBS.Aging at the temperature of 200℃, on the time of 1.5~2h, different contents of titanium and boron are added to the aluminium-copper alloy, the Brinell hardness reaches the top of 140HBS, far quicker than the aluminium-copper alloy reaches the top Brinell hardness.