Smelting-casting technology for Cu-Cr-Zr alloy under air atmosphere was analyzed.Effects of cover agent and de-oxidizer agent on oxide-burning rate and yield rate of alloying elements were investigated。 The results reveal that it is an effective way to improve the yield rate of alloying elements using Cu-Cr and Cu-Zr master alloy and de-oxidize with Cu-Mg master alloy.By using charcoal,graphite chip and a kind of special compound cover agent to protect and control alloy composition,a stable yield rate of al...