The Cu-30 Cr

2

Nb alloy was prepared by rapid solidification in copper mould. The electric-ablation behaviors of the Cu-30 Cr

2

Nb alloy and pure copper was investigated comparatively by discharging in air. The results indicate that cooling rate is the main factor affecting the size and the morphology of Cr

2

Nb phase. With the cooling rate increasing

the average size of Cr

2

Nb particles is decreased and the morphology is transformed from long bars to short rods

then to fine spherical particles. Compared with pure copper

Cu-30 Cr

2

Nb alloy exhibits larger arc spot area

lower current density and smoother arc spot. The higher electric-ablation resistance of Cu-30 Cr

2

Nb alloy is related with the reduced current density and the heat emission of electrons from Cr

2

Nb particles.