The South Gate tower is the main entrance to Qingyan Ancient Town, an arched stone passage beneath a two-storey timber pavilion built in the style typical of Ming military architecture in Guizhou. The walls flanking the gate are original Ming Dynasty stonework, with the distinctive pale-grey limestone that was quarried locally and used throughout the town — for walls, for streets, for building foundations.
Climbing to the tower parapet gives a view along the full length of the main street as far as the North Gate, with the flagstone pavement and wooden facades forming a corridor that opens onto the town's wider geography. The walls extend east and west from the gate in both directions; the full circuit of the wall takes about 45 minutes.