Phase behaviors of aqueous biphasic systems (ABSs) composed of 1-butyl-3-methyl imidazolium tetrafluoroborate ([bmim]BF(4)) + sucrose/maltose + water were reported in this work. Phase diagrams, including binodal curves, tie-lines, and the slope of tie-line (STL) were obtained at temperatures of T = (278.15, 288.15, 298.15, and 308.15) K. The binodal curve data were correlated using an empirical equation, and the tie-line data were correlated according to Othmer-Tobias and Bancroft equations. Good agreements with the experimental data were obtained, and results showed that these equations can be satisfactorily used to correlate the experimental data of the investigated systems at the given temperatures.