The Sui Dynasty was known for its administrative reforms, expansion of central government authority and major infrastructure projects. One of the most significant achievements of the Sui Dynasty was the construction and expansion of the Grand Canal, an extensive network of waterways that connected northern and southern China and facilitated the transportation of grain, goods and troops.
Shang noted that the new finding offers a valuable basis for archaeological research into the Sui Dynasty's regional defense system across North China.
"The latest discovery will help refine understanding of the early Great Wall's chronology, location, route and military defense system in Beijing, while providing new evidence for tracing the course of Sui Dynasty fortifications in Shanxi and Hebei provinces," he said.
The excavation also sheds light on the construction techniques and scale of early Great Wall fortifications.
Although remains of the residential quarters that once existed near the outpost have been severely damaged by years of shallow burials and modern agricultural activities, leaving very few well-preserved traces of daily life or samples suitable for archaeological analysis, researchers have identified important structural features.
"The entrance, for example, was built using a jamb column timber framework, with vertically arranged columns installed along both sides of the gate passage, an architectural form widely used from the Han Dynasty (206 BC to AD 220) through the Sui and Tang dynasties," Shang said.
"The walls were constructed from roughly worked stone blocks laid in a simple pattern. Despite the basic masonry technique, the structure was substantial, with a base width of nearly 5.5 meters."
The scale of construction challenges previous assumptions that early Great Wall sections were relatively narrow and resembled small stone boundaries. Instead, the findings suggest that considerable labor and material resources were invested in constructing the frontier defenses.
Beijing accounts for 2,356 remains connected to the Great Wall. The wall sections extend for 520.77 kilometers in the Chinese capital. The earliest surviving sections date to the Northern Qi Dynasty, while the most extensive construction took place during the Ming Dynasty (1368-1644).
Li Ren contributed to this story.
