Closed-type sunken courtyard floor plan

Quick answer：

A closed-type sunken courtyard floor plan refers to the architectural design of a courtyard that is enclosed and situated below the ground level. This type of courtyard is often found in traditional Chinese architecture, where it serves both as a private outdoor space and as a natural ventilation system for the surrounding buildings. The floor plan typically includes details of the layout, dimensions, and architectural elements such as walls, gates, and pathways.