The dynamic mechanical performances of recycled aggregate concrete （RAC） incorporating with 1% to 2% nano-SiO2 or nano-CaCO3 were tested by Split Hopkinson Pressure Bar （SHPB）.The effects of different kind is of nanoparticles and different dosages on the mechanical performances of RAC were investigated.The results revealed that RACs with nano-SiO2 and nano-CaCO3 all zhowed higher dynamic compressive strength than the control RAC,and the nano-SiO2 was more effectire than nano-CaCO3 in enhancing the dynamic compressive strength of RAC.But RACs with high dosage of nano-SiO2 or nano-CaCO3 usually showed lower dynamic compressive strength than that of low dosage one,and the RAC incorporating with 1% nano-SiO2 achieved the highest dynamic compressive strength.Nano-CaCO3 exhibited more advantage in improving the deformation performance and energy absorption capacity of RAC.Both nano-SiO2 modified RAC and nano-CaCO3 modified RAC showed lower dynamic increase factor than control RAC.