Adopting Lianghekou sandstone as alkali active aggregate, the inhibitory effect of LiNO3 on alkali silica reaction(ASR) was studied at 20, 38, 60, 80℃ by measuring the length of mortar bars and determining the alkali content which was extracted from mortar bars at 28d age. The results show that the influence of curing temperature on ASR expansion rate of mortar rods by LiNO3 is mainly shown between low temperature and high temperature; at 180d age, the inhibitory effect of LiNO3 on ASR of high activity sandstone inhances the expansion rate of the control group at the same temperature increases; the inhibition rate of LiNO3 at 60℃ is the closest to that from concrete prism method, and it is suitable for rapid evaluation of the inhibitory effect of LiNO3.