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Mixed recycled aggregate is hardly to be used in cement mortar as fine aggregate due to the high water absorption, low mechanical properties and weak interracial transition zone(ITZ) between cement paste and aggregate.The effect and enhancement mechanism of nano compound addition on the properties and microstructure of cement mortar was studied in this paper.Results showed that the compressive and bending strength of cement mortar with 100% fine mixed recycled aggregate increased about 10% at most of the curing ages and the shrinkage of cement mortar decreased from 2.5% at 1 day to 21% at 28 days by nano compound addition.Microstructure analysis such as XRD, SEM and MIP indicated that the hydration rate of cement could be accelerated and the density of cement mortar may well be increased by nano compound addition.