The effects of rapid quenching, heat treatment and rapid quenching followed by heat treatment (rapid quenching+heat treatment) on the electrochemical performances of (LaCe)1.0(NiCoMnAl)5.0 hydrogen storage alloy were investigated. XRD analyses indicate that all the alloys are of single phase CaCu5-type structure, and the alloy of rapid quenching+heat treatment has the best crystallizability and homogeneity. The results of electrochemical measurement show that compared with the as-cast alloy, the discharge capacity and cycle stability of the heat treated alloy are improved, but the high-rate discharge capability is significantly reduced. The activation performance, discharge capacity, high-rate discharge capability and cycle stability of the quenched alloy are reduced. Rapid quenching+heat treatment obviously improves comprehensive electrochemical performances of the cast alloy, so the alloy of rapid quenching+heat treatment has good activation capability, better discharge capacity (344.7 mA/g), higher capacity retaining rate (S100, 85.67%) and better high-rate discharge capability