This work aims to explore the novel interaction approach by augmenting the personal space with the proposed wearable device. In the proposed system，a hat-type wearable device is designed to project the personal information onto the ground floor in front of the wear. A small projector is mounted on the bottom of the proposed device，and the folded mirrors are adopted to reflect the projection image upon the projector. The proposed system is anticipated to support our daily-life activities and facilitate the personal communication. In our case study，we demonstrate the function of map navigation.