In his later years, Emperor Taizong of Wu Zhou was troubled by the prince problem. Prince Li Chenggan fought with Wang. As a result, Emperor Taizong abolished the two of them, and finally made Li Zhi, the ninth son of a wise man, the King of Jin, a prince. After the death of Emperor Taizong, Li Zhi acceded to the throne for Tang Gaozong. During the reign of Emperor Gaozong, he accepted the invitation of Silla, and finally destroyed Goguryeo and Baekje and defeated Japanese reinforcements. Let Silla unify the Korean peninsula. In Tang Taizong's later years, Tang Gaozong had an affair with Wu Shi, a gifted scholar of Tang Taizong, that is, Wu Zetian, which was a great unfilial act. After the death of Emperor Taizong, Wu entered Ganye Temple and became a nun. When Emperor Gaozong was at war with Xiao Shufei, in order to compete with Xiao Shufei, the queen took the initiative to let Emperor Gaozong take Wu Shi back to the palace. After Wu entered the palace, he successively abolished the queen and. Under the opposition of the minister, Gao became the queen of Wu. The emperor was in poor health, and many political affairs were handed over to Wu Hou. Shortly after the death of Emperor Gaozong, Wu Zetian made Li Xian Emperor of Tang Zhongzong. Soon, he abolished Zhongzong and made his other son Li Dan emperor. After the rebellion was put down, in the first year of God's grant (690), Wu Zetian abandoned grass as emperor, changed Tang Dynasty to Zhou Dynasty, and made Luoyang its capital, which was called "Wu Zhou" in history (690 -705) and claimed to be the Holy Spirit Emperor. Wuhou also became the only woman who claimed to be the emperor in the history of China Dynasty. Because of the word "Zetian" in posthumous title, some scholars have called it "Wu Zetian" since modern times, but this is not a rigorous title. In the fifteenth year of Wu Zhou, in order to attack the influence of aristocratic families since Emperor Gaozong, Wuhou vigorously promoted officials who passed the imperial examination and entered the official position. Di Renjie is one of them. She also arranged for her nephews and confidants, such as Wu Sansi and Wu Chengsi, to be important maintenance personnel. Traditional historians criticized Wu Hou, such as Suo Yuanli, Lai Junchen and Zhou Xing, and they encouraged her to spy on her ministers through informers and torture. Wuhou often bypassed the province under the door, and Zhongshu Province directly gave orders to officials, which set a precedent for destroying the official system. Butler Zhang Changzong and Xue Huaiyi, etc. However, there are many traditional male emperors' harems. Wuhou also highly respected Buddhism. For example, Buddhist temples were frequently built during the Wu and Zhou Dynasties, and the year numbers were used to prove saints and Dazu. This is in sharp contrast to Li's worship of Taoism and the titles of Zhenguan, Yonghui, Jing Yun and Kaiyuan. In addition, Wuhou became an imitator of the women in the Tang Dynasty's harem fighting for power and profit. In the first year of Shenlong (705), Wei Hou came to power, and Jing Hui and Prime Minister Zhang Jianzhi staged a coup to restore the political power of the Tang Dynasty. Li Dan was made king of Xiang. However, Zhongzong was always influenced by Wei Ruyun, Princess Anle, his daughter and party member Wu Sansi, the elder of Wuhou. Both Zhang Jianzhi and Jing Hui were exiled or killed. Wei Ruyun intends to be the second marquis of Wu, and Princess Anle once asked to be the wife of the emperor. In the fourth year of Jinglong (7 10), Wei Ruyun and Princess Anle conspired to poison Zhongzong. Wei Ruyun made Li Zhongmao, king of Wen, emperor, in order to be a young emperor and to harm Li Dan, king of Xiang. Li Dan's son, Li Longji, then the king of Linzi, staged a coup with the help of his aunt Princess Taiping, killing Wei Ruyun, Princess Anle and the remnants of Wu Shi, and resetting Li Dan. After the prosperous new century, Zong Rui's sister Princess Taiping fought a power struggle with Li Longji. In the first year of Yanhe (7 12), he gave way to the prince, that is, also known as Tang. In July13, Emperor Xuanzong of the Tang Dynasty gave Princess Taiping the death penalty, and followers either killed or chased her, which ended the chaotic political situation known as the "Hou Wei Rebellion". In the same year, it was changed to Kaiyuan. Tang Xuanzong reigned for 44 years. In the early period (Kaiyuan years), the politics was relatively clear and the economy developed rapidly. The Tang Dynasty entered its heyday, which was called "the prosperous time of Kaiyuan" in history. This period is considered to be the second heyday in China's history after the reign of Emperor Wu of the Han Dynasty (the heyday of Hanwu). Chang 'an, the capital, became the largest city in the world at that time and the first city with a population of one million.