At the beginning of the founding of the Tang Dynasty, the four sides were undecided, and everything needed to be done. After Tang Gaozu made Chang 'an its capital, it still used the imperial palace of the Sui Dynasty-Daxing Palace, which was later renamed Taiji Palace after Tang Ruizong acceded to the throne. This magnificent palace complex located in the northernmost part of Chang 'an City, also known as Jingda Inner and West Inner, is actually the floorboard of Taiji Palace, Dongfang Palace and Yeting Palace.