Drying process of polymer solution coated on a flat substrate is very important in various industrial applications. Then we have proposed and modified a model of drying process of polymer solution coated on a flat substrate for flat polymer film fabrication. In the previous study, we added Marangoni effect as pseudo-negative diffusion on an upper gas-liquid interface to the former model. And we saw through numerical simulation of the modified model that solute on upper gasliquid interface was attracted more strongly to the edge due to Marangoni effect. In this study, we show that this effect is remarkable on upper gas-liquid interface, while the effect extends to sufficiently inside of the polymer solution film.