In order to obtain the data of the physical properties of ionic liquids and organic, the densities of two imidazolium-based ionic liquids, 1-butyl-3-methylimidazole tetrafluoroborate ([BF₄]) and 1-butyl-3-methylimidazolium hexafluorophosphate ([PF₆]), and their binaries with N,N-dimethylformamide (DMF) at the temperature range from 293.15K to 353.15K in atmospheric pressure were determined, respectively. Excess molar volumes(VE) of solution have been obtained from these experimental data and they are negative. It has been interpreted in terms of ion-dipole interactions and structural factors of the ionic liquid and DMF. The temperature and the concentration of DMF dependency were correlated with the density value by using a linear equation and fifth-order polynomial. The correlations give satisfactory results.