Abstract: The Zr-based nanocomposite hydrogen storage materials Zr0.9Ti0.1 (Ni0.55V0.12Mn0.28 Co0.05)2.1-X% Mg (X=10, 20) were prepared by two ways: ball-milling + sintering treatment (BMS) and mechanical alloying + sintering treatment (MMS). XRD and TEM-SAED examinations show that microstructure of the materials is composed of MgCu5-type cubic structure C15-Laves phase and hexagonal structure Mg. Their electrochemical performance tests show that the composite electrodes (MMS, BMS) have good activation properties at 60 mA/g current density. The maximum discharge capacity of MMS electrodes is 410 mAh/g(x = 20), while BMS electrodes is 360 mAh/g (x=20). At high current density(≥3000 mA/g), the discharge capacity of BMS electrodes is obviously higher than those of the MMS electrodes. The BMS(HTQAB2.1-10% Mg) electrode shows the best current density discharge performance. Therefore, HTQAB2.1 type Zr-based nanocomposite materials are suitable for not only high-energy NiMH batteries but also high-power NiMH batteries.