A complex approach combining atomistic molecular dynamics (MD) and thermodynamic simulations was discount greenery applied to predict segregation in binary Au-Ag nanoparticles consisting of 2000 atoms (of about 4 nm in size).Both approaches predict the surface segregation of Ag to the surface of Au-Ag nanoalloys.Besides, Au-Ag nanoparticles demonstrated an onion like structure with an outer Ag monolayer.The results il2510 of MD and thermodynamic simulations agree with the available experimental data.