Abstract: The electrode alloy La_0.7Mg_0.3Ni_2.5Co_0.5 prepared by the spark plasma sintering (SPS) technology was used to investigated the improvement in electrochemical properties of La-Mg-Ni hydrogen storage alloys, The experimental results indicated that the maximum discharge capacities of the electrode alloys respectively prepared by SPS and vacuum medium-frequency induction melting were close, Using the SPS technology would decrease the weakening rate of capacity of the electrode alloy, After 150 cycles, the retention rate of capacity was 61.8% for the SPS technology, but 39.6% for the induction melting method, At the same time, the SPS technology would also increase the discharge medium voltage, broaden the discharge platform, and decrease the gradient of the platform.