Abstract: Zr_52.5 Cu_17.9Ni_14.6Al₁₀Ti₅ bulk amorphous alloy was prepared by a water-cooled copper mold. The alloy system has an excellent glass formation ability (GFA) and a wide supercooled liquid region. The glass transition temperature (T_g), the crystallizaion temperature (T_x), the fracture stress, the plastic,Vickers hardness and elastic modulus for the bulk amorphous alloys with a diameter of 3 mm are 377.63℃,448.9℃,1 730 MPa, 0.5%, 558 and 82 GPa, respectively The bulk amorphous alloys have good mechanical properties. The excellen glass formation ability of Zr_52.5Cu_17.9Ni_14.6Al₁₀Ti₅ alloys is presumably due to a combination of significatly differen atomic size ratios above about 12%, multicomponent alloy system consisting of more than three elements and optimum negative heats of mixing among the constituent elements.