<正>1.Introduction to rare earth hydrogen storage alloys1.1 Type of hydrogen storage alloy There are five different types of hydrogen storage alloy,including magnesium-based type,calcium-based type,rare earth-based type,zirconium-based type and titanium-based type.Magnesium-based hydrogen storage alloys gathered a lot of attention these days.Shanghai Jiaotong University and Chongqing University have carried out a lot of research onmagnesium-based hydrogen storage alloys,