Al-Mg-Zn-(Cu-Er-Zr) system alloy is a novel alloy designed by materials genetic method for laser additive manufacturing of lightweight brake discs and the T-phase (T-AlMgZnCuZrEr) in this alloy is the most important microstructure for enhancing performance matching of the alloy. Scientifically regulating the T-phase evolution through innovative preparation processes to improve the matching of strength-toughness, wear resistance, and corrosion resistance in this novel alloy is the fundamental work for preparing high-performance lightweight high-speed train brake disc parts using laser additive manufacturing. In this work, laser powder bed fusion and post heat treatments were employed to prepare Al-Mg-Zn-(Cu-Er-Zr) alloy samples with the superior matching of strength-toughness, wear resistance and corrosion resistance, and the key T-phase evolution and performance enhancement mechanisms of the samples were studied. The results indicate that post heat treatments significantly influenced the quantity, size, and structure of the T-phase in the cladded sample, which significantly enhanced the strength-toughness, wear resistance and corrosion resistance matching of the alloy. It is found that under the optimized aging treatment at 200 °C/6 h, due to the evolution of T-phase area fraction and cell-like structure inside the T-phase, the strength-toughness, wear resistance and corrosion resistance were improved by 30 %, 28 %, 1.4 %, respectively. The precipitation and concave dissolution mechanisms of the T-phase during post heat treatment have been finely revealed, and a three-performance matching relationship model has been successfully constructed based on the strength-toughness matching equation. A new laser powder bed fusion followed by the aging process to manufacture an Al-Mg-Zn-(Cu-Er-Zr) alloy sample with the superior matching of strength-toughness, corrosion resistance, and wear resistance has been obtained, which provides a valuable reference for laser additive manufacturing high-performance lightweight aluminum alloy brake disc parts.