After Emperor Taizong Tang Gaozu ascended the throne, he made Li Jian a prince and handled all kinds of affairs in the palace. Li was also a representative of civil servants at that time. At that time, Emperor Taizong was made King of Qin. He was mainly responsible for the foreign wars of military generals, and in the process of foreign wars, Emperor Taizong also made the greatest contribution. On July 2, 626, Emperor Taizong of Yang Hao staged a bloody coup near the Xuanwu Gate at the north gate of Chang 'an Palace. After the coup, Emperor Taizong killed his eldest brother, Prince Li, and his fourth brother, Prince Yuanji. He became Emperor Taizong and later Emperor Tian. Besides Emperor Taizong of Xuanwu Gate, who else was killed? After he succeeded to the throne, Emperor Taizong issued an imperial edict, making his younger brother Li Jian a hermit, and his younger brother Qi Li Yuanji a Hailing District, which was named Hailing District, and was reburied at the royal funeral.

On the day of the funeral, Emperor Taizong cried at a mound gate and advised Wei Zhi and Gui Wang Dafu to accompany the hearse to the cemetery. Officials from the former East Palace and Qi Palace attended the funeral. Li and Li Yuanji seem to have regained their status, but the title and the title behind them seem to have lowered their status.

After the completion, the prince was reduced to the prince, and Yuanji was reduced from the king of Qi to the king of the county. After their death, their titles were all swearing. When Emperor Taizong executed his brother, he did not release their son. According to historical records, Emperor Taizong executed his brother's ten sons, five of whom were sons of Li and the other five were sons of Li Yuanji. Li's sons killed by Emperor Taizong were Baron, Baron Runan, Baron Wu 'an, Baron Hedong and Baron Anlu. Li Yuanji's sons killed by Emperor Taizong included Li Chengdu, Wang Yiyang, Li Chengyu, Pu Li, fishing king Li and Wang Li. Because of the change of Xuanwu Gate, there are many controversies about Emperor Taizong. Some people even compared the way Emperor Taizong ascended the throne to Yang Di, so many people were slandering Emperor Taizong. Emperor Taizong killed not only Li's son and Li Yuanji, but also their daughter. Did Emperor Taizong kill his brother's daughter after the Xuanwumen rebellion? Actually, this is the picture frame of the eternal king. Emperor Taizong didn't kill his brother's daughter. According to the epitaph of Liu Yingdao's wife in Tang Dynasty unearthed in Shaanxi, the daughters of Li and Li Yuanji were not slaughtered. According to the epitaph, Li Wanshun, the second daughter of Li, was named wenxi princess by Emperor Taizong at the age of ten.

Later, Emperor Taizong married the princess to the son of the Tang Dynasty minister, and his second daughter, Li, lived here. In addition, the epitaph also records Li Yuanji's daughter in detail. Li Yuanji has a daughter named Li Ling, the sixth daughter of Li Yuanji. After the change of Xuanwu Gate, Li Ling was not killed, but adopted by Emperor Taizong, making him the monarch of Xinye County. As an adult, his marriage is very happy. Li Yuanji and his daughter were Wen 'an county magistrates, but the Xuanwumen rebellion was not killed.