People' visual information when walking on stairs is regarded an important variable that may affect their posture and balance in previous studies, but the detail of their eye movement remains unclear. In this study, we focus on people's eye-movement when walking on stairs and design an experiment to examine subjects' visual information (visual field and fixation) and possible influencing factors by using a mobile eye tracker. Based on data analysis, our results proved that the movement of going up/down stairs are significantly related to subjects' visual field. The results also indicated that the factor of subjects' gender affects both visual field and average number of fixation, but the factor of load-carrying situation only affects visual field. Some foundational insights of this study can be used to detect the fall risk for the elderly.