Huangsipu Site is located within the territory of Tangqiao and Yangshe Towns of Zhangjiagang City, Suzhou. It was listed as a Major Historical and Cultural Site Protected at the National Level by the State Council of China in 2013. The Site consists of two parts, one is the Dongdu Garden Scenic Area which takes the ancient Huangsipu Dhvaja as the core part; and the other is Huangsipu underground buried area. The site covers an area of about 4 square kilometers with Huangsipu River passing through. According to legend, the Huangsipu River was dug by Prince Chunshen or Huang Xie of the State of Chu during the Warring States Period, and was dredged repeatedly in later times, which can still be used for shipping even in the 80s of the last century. Currently, the river is about 8 km long. After 1994, the Zhangjiagang Municipal Government built Dongdu Garden near Huangsipu River, where locate the Jianzhen Monk Memorial Hall, Dhvaja and other facilities.
In December 2008, the national cultural relics survey team who conducted the third relics survey of Zhangjiagang city in Jiangsu Province found a large range of relics in Qing'an Village of Yangshe Town, southwest of Dongdu Garden. From the west to East on the site, three dense building remains were unearthed, which are the original site for Zunsheng Temple, the original sites for the central market of the Qing'an Town and Jinghua Temple, and the original sites for estern market of Qing'an Town, gutters, and wharves.
As a port type site of Tang and Song Dynasty, Huangsipu Site is noted for its large amount of docks, warehouses, workshops, shops, houses, temples, roads relics, which are rarely seen in other sites of the same period in China. The excavation of the site provided the important materials for research on the past conditions of Huangsipu in Tang and Song Dynasties and it relevance to the most important cultural event of Monk Jianzhen’s sixth navigation eastward to Japan.