We need to know snowdrift patterns in order to assess snow load on a building. Various methods have been studied to evaluate snowdrift patterns, but the most effective one is the use of snow particle. This study examined how to simulate of snow particle, and analyzed snowdrift patterns on buildings using a wind tunnel system. Snow particle was produced with sodium bicarbonate. Snowdrift patterns on buildings simulated using snow particle were compared with measured data obtained from a real building (the roof of low-rise building and antarctic building). In the results of wind tunnel experiment with buildings using snow particle, the snowdrift patterns on flat roof and gable roof according to wind velocity agreed well snow accumulation of real building. The form of snow accumulation around the antarctic building was similar to the form of snow accumulation actually measured by Mitusuhashi.