In this article we propose a numerical analysis of the heat and mass transfer in a binary thin film flowing on an inclined plane. This analysis rests on the resolution of transfer equations in liquid and vapour phases by using an implicit finite difference method. These equations are coupled and the mass diffusion in the liquid film is taken into account. The most interesting results are obtained in forced convection, particularly in the case of ethylene glycol-water mixture. In fact, results obtained show that it is possible to increase the accumulated evaporation rate when the molar fraction of ethylene glycol is less than 40%. In addition, even if the heat transfer coefficient decreases generally when the ethylene glycol composition in the mixture increases, it was found that is is possible to stabilise perhaps to increase the heat transfer coefficient. This remark has already been observed by other authors.