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Zinc stannate (ZS) is a new kind of flame retardant agent. In this paper the effect caused by ZS and silicon synergistic agent to the hydroxide/polymer (EVA/LLDPE) system before and after aging process is studied by means of LOI, DSC, mechanical and dielectric properties measurements. The results show that before aging process the filling content of ZS has little influence on the flaming, mechanical and dielectric properties of the composite systems. But after aging process comparing with the composite without ZS, the strength of the composite with ZS is reduced sharply and the OI value is raised a little. The mechanism is primarily discussed in this paper.