Thermodynamic equilibrium phase composition,Jominy hardenability,phase transition,thermophysical properties and mechanical properties after quenching and tempering of the 16CrSiNi steel were simulated by using JMatPro software,and the thermodynamic equilibrium phase compositions,hardenability curves,TTA curves,TTT curves,CCT curves,quenching microstructure,mechanical properties after quenching and tempering,thermophysical properties under different temperatures as density,thermal conductivity,Young's modules,specific heat,Poisson's ratio and enthalpy were obtained.