Based on the fabrication of CuZr binary bulk metallic glass(BMG), we have produced a series of CuZr-based BMGs prepared by Al addition using a copper mold casting method. CuZr-based BMGs with good glass-forming ability (GFA) have a broad g lass-forming composition range. When Al content changes from 4% to 8%, CuZr-bas ed BMGs can be produced in cylindrical rods with a diameter of at least 5mm. The physical reason of the good GFA in the alloys is analyzed. CuZr-based BMGs have a simple structure and are lower cost, so it is very possible to have potential application. At the same time, the way that we explored the CuZr-based BMGs is an effective route for designing and obtaining new multicomponent BMGs.