Abstract: Cemented tailing backfill(CTB) with different binders and sulphate content were made and uniaxial compressive strength(UCS) tests, suction monitoring, water ration and void ratio tests were performed on all samples at curing time of 1 day, 3 days, 7 days and 28 days.The reasons of early strength and early suction evolution of CTB, as well as the relationship between early strength and early suction of CTB, were analyzed.The results show that, there is a significant linear correlation between UCS and suction of CTB at early ages in sealed curing condition.Correlation equation between UCS and suction were gotten.The possibility of early strength in-situ monitoring of CTB based on suction evolution was discussed.