As a medium of spatial transformation, the interface of classical Chinese gardens emphasizes the integration of enclosure function, activity function, and cognitive spirit, which has a specific reference value for modern architectural design. This study defines the concept of interfaces that delineate scenic areas within gardens, selecting the clearly defined scenic area of the late Qing Dynasty Garden, Ho Family Garden, as the research subject. It analyzes the types and combinations of interfaces within the garden and, in conjunction with observations of viewing behavior, ultimately summarizes the organizational patterns of garden interfaces. The research findings indicate that the interfaces of Ho Family Garden can be categorized into three types: street-garden interfaces, residential-garden interfaces, and internal division interfaces. The main combination methods of these interfaces include adjacency, overlapping, and intersecting. Furthermore, different combinations of interfaces can create specific patterns that influence viewing behavior. This study expounds the ideological wisdom and cultural characteristics of spatial separation in traditional Chinese gardens from the dualistic attributes of the inner and outer interfaces of the garden. It explores the ideas and techniques of spatial separation that have reference and reference significance for modern architectural design.