This paper aims to clarify the spatial characteristics of Chin-Dei (the typical open space in Macao in front of buildings) in the old district of Macao. Focusing on the continuity of both uses and inclination of Chin-Dei and the adjacent streets, the spatial characteristics are classified. Firstly, the boundary of Chin-Dei is continuous to the adjacent streets without change of uses and inclination. Secondly, the boundary of Chin-Dei is distinct from the adjacent streets because of the change of uses correlate with the inclination of streets. This indicates the effective types of open public spaces to adjust the mixture of urban functions for the high-dense city.
