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Molecular dynamics simulation method was used to study the influence of NO2-on both the structure and properties of the binary nitrate salts (60 wt.％ NaNO3 + 40 wt.％ KNO3).The density and viscosity of the mixtures were experimentally measured and the simulation results met well with the experimental ones.The simulation results showed that,with the addition of NO2-,the ionic clusters tended to loose and the mobilities of all the ions tended to increase.The density,viscosity,and heat capacity decreased while the thermal conductivity increased with the increase of NO2-concentration.The correlation between the microscopic structure and physical properties of the mixtures were discussed and revealed.