Effects of Fe, Mn and Si on the hydrogen-induced amorphization in LaNi3 were investigated by XRD and electrochemical method. All the LaNi2.5M0.5 (M = Ni, Fe, Mn and Si) alloys were prepared by melt-spun plus annealing method and their main phase is LaNi3. It is found that the hydrogen-induced amorphization appears in all the alloys for the first charging cycle. During the discharge process, no plateau is observed in LaNi3 and LaNi2.5Fe0.5 but a plateau in LaNi2.5Mn0.5 and LaNi2.5Si0.5, indicating that a small amount of Mn and Si suppresses the tendency of hydrogen-induced amorphization.