Jiucheng Palace of the Tang Dynasty has an important place in the history of the classical Chinese garden and has been known as the crown of the affiliated palaces. It`s a typical representative of the landscape-architecture palaces. Through the integration of historical documents, archaeological data, and field research, we clarify the reasons for the location of Jiucheng Palace in Lingyou, analyze the layout principles of the palace in relation to its plan form, and make the first attempt to restore the natural landscape pattern in which Jiucheng Palace was located, and then explore its planning features. Jiucheng Palace was built to suit the development of the country and the needs of the emperor, and the site was chosen for its scenic beauty; its layout was cleverly borrowed, and its architecture and landscapes reflect the harmonious balance between man and nature and have influenced the construction of landscape garden in later generations.