Abstract: In order to study the effects of titanium on the properties of Mg₂Ni hydrogen storage materials,various contents of alloying element titanium was added in the hydrogen storage alloy Mg₂Ni, and the mi-crostructure,hydrogen absorption and desorption performances and cycle stability of the material were test-ed and analyzed.The results show that titanium could refine the grain and improve the hydrogen absorption and desorption performances as well as the cycle stability of the material.Compared to the material without titanium(Mg₂Ni),the average grain size of Mg₂NiTi_0.2 alloy decreases by 55.63% while the maximum ab-sorption of hydrogen increases by 47.37%, and the discharge capacity decay ratio decreases by 48.80% after 20 times of charge and discharge cycles with hydrogen absorption saturation time and hydrogen re-lease platform pressure essentially unchanged,at the optimum content of 8.233% titanium.