The solubility of isomalt in the water + ethanol solvent system was measured with the mole fraction of water ranging from 0.00 to 1.00 at (288.15, 298.15, 308.15, and 318.15) K by using the laser method that is timesaving and the gravimetric method that is more reliable. The data were fitted using the simplified Jouyban-Acree model. In this study, the solubility data obtained by these two methods were compared. The mean relative deviations for isomalt solubility determined by the laser method and the gravimetric method were less than 25 % and 17 %, respectively.