Bus station is one of the important facilities in mass transportation service. Nevertheless, when people are waiting for bus, they will choose different standing posture such as upright standing and leaning against wall, referring to different bus station construction. Hence the study of different standing posture provides ergonomic perspective to design bus station. The postural control in leaning-against-wall posture during prolonged standing is investigated. In present paper 20healthy volunteers were instructed to upright stand or lean against wall for 15 minutes. The pressure distribution of foot was collected, and the standard deviation of center of pressure (CoP) in AP and ML direction and asymmetrical standing condition were analyzed. The result indicated that in leaning-against-wall posture, the percentage time and frequency of asymmetrical standing and standard deviation of CoP in AP direction are significantly different between two postures.