Yuanmingyuan was built in 1709 (forty-eight years of Kangxi). It was originally a gift from Emperor Kangxi to Yin Zhen, the fourth son of Emperor Kangxi. After Yongzheng 1722 ascended the throne, the original garden was expanded, and Zheng Da Guangming Hall, Qin Zhengtang and the value rooms of the Cabinet, Sixth Department and Military Department were built in the south of the garden, so as to "avoid noise and listen to politics" here in summer. During the Qianlong period, in addition to the local reconstruction of Yuanmingyuan, Changchun Garden was built in the east and merged into Wanchun Garden in the southeast. The pattern of three gardens in Yuanming has basically taken shape. Jiaqing Dynasty mainly renovated and expanded Qichun Garden, making it one of the main garden places. During the reign of Daoguang, state affairs declined and financial resources were insufficient. However, the furnishings of Wanshou, Xiangshan and Yuquan "Three Mountains" were withdrawn, Jehol stopped summering and Mulan hunted, and the reconstruction and decoration of Yuanming Three Gardens have not been abandoned. 1860, the British and French allied forces looted the Yuanmingyuan, and the cultural relics were looted. When Emperor Tongzhi wanted to repair it, he was forced to stop and rebuild other buildings due to financial difficulties. After Eight-Nation Alliance, it was attacked by bandits and eventually turned into ruins.