This study tries to fine out how the museum visitors use the public·service space. and in the sense that their movement in the spaces may have close relationship with visibility, it uses Isovist in order to fine out the causes on how they move around the public·service space. The study suggests that there is strong relationship between the visitors movement in the public·service spaces and visibility from a certain point. As far as the public·service spaces are concerned, therefore, it is important to consider visibility from certain point such as the museum hall or the main entrance.