The simultaneous addition of Al and Ag to Zr–Cu binary alloys increased in the stabilization of supercooled liquid, the reduced glass transition temperature and γ value, leading to greatly enhance the glass-forming ability (GFA). The Zr–Cu–Ag–Al glassy alloy samples with diameters above 15mm were obtained in the wide composition range of 42–50at% Zr, 32–42at% Cu, 5–10at% Ag, and 5–12at% Al. The best GFA was obtained for Zr 48 Cu 36 Ag 8 Al 8 alloy, and the glassy samples with diameters up to 25mm were fabricated by an injection copper mold casting. The Zr 48 Cu 36 Ag 8 Al 8 glassy alloy exhibited high tensile and compressive fracture strength of over 1800MPa.