The Longquan Mansion Site in Shangjing of Bohai State is located in jingpo Lake Global Geopark. It is the ruins of the ancient city of Longquan Mansion in Shangjing of Bohai State in Tang Dynasty. Longquan Mansion in Shangjing is the most important capital of the Bohai Kingdom and the capital that has been the capital of the Bohai Sea for the longest time. It has witnessed the rise and fall of Bohai, the "prosperous country in the east of the sea", and the historical process of the integration of the Sushen ethnic group and the Mohe ethnic group into the Chinese nation. It is a historical witness to the diversity and unity of the Chinese nation. The study of the layout, function, system, architecture, cultural relics and other aspects of the Longquanfu site in Shangjing, Bohai State, is not only of great significance in the field of Bohai archaeological research, but will also have an important impact on many research fields such as the history of Chinese urban development and architectural history. In 1961, it was approved by the State Council as a national key cultural relics protection unit.