The effects of heat treatment at 673 K, 1 173 K and 1 373 K on the ele ctrochemical properties of the hydrogen storage alloy LPC(NiCoAlMn)5 0, such as activity, discharge capacity and rate-of-discharge capacity, have been invest igated. The results show that the cycling stability and large discharging capaci ty are improved. The alloy heat treated at 1 173 K has good electrochemical prop erties.