The changes in phase structure and hydrogen storage properties of Ti0.9Zr0.1Mn1.5 alloy after modification by mechanical ball-milling for different time(t = 0 min,10 min,30 min,60 min)were investigated systematically.The XRD and SEM analysis show that all of the as-cast and ball-milled alloys consist of a single C14 type Laves phase with hexagonal structure.The ball-milled alloy powders appear aggregation to some extent,the particle size decreases and the activation behaviour is improved with the increase of ball-milling time for the alloy.It is found that the as-cast alloy is activated after 4 hydriding/dehydriding cycles,and its maximum hydrogen absorption capacity and effective hydrogen desorption capacity at room temperature are 209.3 ml/g and 157.6 ml/g,respectively,and the efficiency of hydrogen desorption/absorption is 75.3%.The maximum hydrogen absorption capacity and the effective hydrogen desorption capacity increase firstly then decrease at room temperature with the maximum values of 231.4 ml/g and 203.8 ml/g at t=30 min,respectively,while,its efficiency of hydrogen desorption/absorption reaches 88.1%.This shows that the overall properties of Ti0.9Zr0.1Mn1.5 alloy can be improved effectively by ball-milling.