In order to improve the resistance to natural aging and softening, and property stability of ornamental silver, the dependences of mechanical properties of the silver alloyed with 0 12 wt%(La+Y) on aging temperature have been studied. The experimental results show that the hardness and resistance to softening of Ag can be improved by the addition of small amounts of rare earth elements. SEM analysis indicate that significant grain refinement result. The rare earth additions effectively defer the recovery and recrystallization of silver, thereby improving the resistance to natural aging and softening, and increasing the repeatablility of property.