In 762 AD, Su Zong fell ill and could not go to court for several months. In April, Xuanzong died of illness. His grief persisted and his condition worsened. Queen Zhang summoned the prince, and the queen said, "Li Changchang is in charge of the forbidden army and has too much power. The only thing he fears is you and me. At present, your majesty is critically ill, and he is colluding with Cheng and others to make trouble. He must kill them immediately first. " The prince said with tears, "Father Huang is seriously ill, so it is not appropriate to tell him about it. If we kill Li ourselves, Dad Huang will be shocked, which is not good for his health. I think this matter will be postponed. " Queen Zhang sent the prince away and immediately called Su Zong's second son. Li, King of Yue, entered the Inner Palace to discuss. Li immediately ordered Duan Hengjun, the eunuch, to select more than 200 robust eunuchs and give them weapons, ready to start work. Someone reported this to Li in the eunuch prison. Li, Cheng, and the soldiers went outside to find out the news, and they met the prince entering the palace to see his father. Li lied that there was a change in the palace, prevented the prince from entering the palace, and ordered his henchmen to move the prince into the temple to monitor him. Li lied about the prince's order, instigated the imperial army to enter the palace, arrested Li, Duan Hengjun and others and put them in jail. When Queen Zhang heard of the accident, she hurriedly fled into Su Zong's bedroom to escape. Li's pursuers entered the bedroom and forced Queen Zhang out of the palace. Queen Zhang refused to accept and begged Su Zong for help. Su Zong was too scared to speak for a moment. Lee took the opportunity to drag Queen Zhang out of the palace. Su Zong suddenly became seriously ill because of shock, and no one asked him, and he died in the Palace of Eternal Life that day.