Abstract:The recent progress on study of composite hydrogen storage alloy as negative electrode of Ni/MH battery is reviewed, focusing on the major component, main methods of preparation, analysis and characteristic methods, micro-structural characteristics, electrochemical performance, and mechanism of hydriding and dehydriding. The composites are classified into five kinds based on the major component, e.g. AB5 type rare-earth hydride material, AB2 type hydride material with laves phase, A2B, AB type Mg-based hydride material, solid solution hydrogen storage alloy with BCC structure and new type La-Mg-Ni-based hydride material with stacked structure, respectively. The existing problems on research of the composite hydride materials are pointed out and the prospect of the composite development has been viewed.