Mass transfer during osmotic dehydration of banana has been studied. The solution of Fick＇s law for unsteady stare mass transfer in cylindrical configuration has been used to calculate the effective diffusion coefficients over a range of temperature (25-35 degrees C) and concentration (40-70 degrees B) of osmotic solution. The effective diffusion coefficient has been empirically correlated with the concentration and temperature of osmotic solution by an Arrhenius-type equation. A high degree of correlation (R-2 = 0.97) was observed between predicted and experimental values of the effective diffusion coefficient.