Abstract: Heat treatment of casted and spray formed Cu-3.2Ni-0.75Si alloys was compared,the aging characteristics of three kind of the spray formed alloy in the states of solid solution +60% cold rolling,60% cold rolling and original were investigated.Meanwhile,their micro-hardness and electric conductivity were analysized.Resultsshow that,cold rolling before aging can prompt precipitation and increase strengthening effect.The growth of precipated phase before aging is the main cause for rapid decrease of micro-hardness,the solid solution +60% cold rolling alloy can obtain highest micro-hardness(301Hv),and the 60% cold rolling alloy can obtain highest electric conductivity.