An ionic liquid is a salt in which the ions are poorly coordinated, which results in these solvents being liquid below 100 degrees C, or even at room temperature. At least one ion has a delocalized charge, and one component is organic, which prevents the formation of a stable crystal lattice. In the present work three classical thermodynamic models has been selected to predict the surface tensions of ionic liquid binary mixtures based on the CSGC model (corresponding-states group-contribution method), HSEG model (extended Guggenheims ideal solution model), and parachor model. To predict the surface tension of ionic liquid binary solution, we calculated critical parameters, density, and surface tension of pure component. To compare, theoretical and experimental data average standard deviation values have been calculated. These values for the studied ionic liquid binary systems show the HSEG model has good accordance in comparison with other predictive equations.