Liu Zhang was the youngest son of Liu Yan. The mother Fei was the clan aunt of Fei Guan, who later married Liu Zhang's daughter. In the fifth year of Zhongping (188), Liu Yan proposed to Emperor Hanling to establish a prefecture to oversee military and political power in various places, and he himself served as the pastor of Yizhou, while Liu Zhang, together with his brothers Liu Fan and Liu Shi, remained in the capital, and only Liu Mao followed Liu Yan into Shu. Liu Zhang later served as the governor of Fengche, and was sent by the imperial court to edict Liu Yan, who left him behind and did not return to the court. In 194, Liu Fan conspired with Ma Teng to attack the chancellor Li Dai in Chang'an, and after the leak, he was killed along with Liu Shi, and Liu Zhang was spared. Liu Yan's descendant Lang Pang Xi protected several of Liu Yan's grandsons and sent them to Yizhou. Because of the pain of the death of his son, Liu Yan had no choice but to move to Chengdu because of the fire in Mianzhu City, and died of a back gangrene attack.
After Liu Yan's death, the Yizhou official Zhao Yun and others hoped to use Liu Zhang's Wenren, so they wrote to him to succeed yizhou and be the pastor of Yizhou. The generals Shen Mi, Lou Fa, and Gan Ning rebelled against Liu Zhang, and after being defeated by Zhao Yun, they ran to Jingzhou. In the fifth year of Jian'an (200), Liu Zhang sent troops to defend against Liu Biao's Zhao Yun's reactionary rebellion, and Shudi responded in many places, but fortunately, liu Yan's "Dongzhou soldiers" established by taking in Jingzhou and the three auxiliary displaced people fought to the death, and only then did they quell the rebellion and kill Zhao Yun in Jiangzhou.
Liu Zhang was a coward, and Zhang Lu of Hanzhong, who was originally attached to Liu Yan, was arrogant and did not listen to Liu Zhang's orders, so Liu Zhang killed Zhang Lu's mother and brother, and the two sides became enemies, liu Zhang sent Pang Xi to attack Zhang Lu and was defeated.
After that, there was news that Cao Cao would come to attack. Under internal and external pressure, Liu Zhang listened to the words of his subordinates Zhang Song and Fazheng and welcomed Liu Bei into Yizhou, hoping to use Liu Bei's strength to resist Zhang Lu and Cao Cao. Unexpectedly, this move was to lure the wolf into the house, Liu Bei soon used the excuse to attack Liu Zhang, and Fazheng responded to Liu Bei's internal response, and liu Zhang's two generals Yang Huai and Gao Pei were killed by Liu Bei.

The war between the two sides lasted about two years, during which Liu Zhangjun killed Liu Beijun's military division Pang Tong, leaving Liu Bei in a bitter battle. Later, Zhuge Liang, Zhang Fei, and Zhao Yun reinforced Liu Bei from Jingzhou, and successfully besieged Liu Zhang in Chengdu, and sent Jian Yong to persuade Liu Zhang to surrender.
At that time, there were still 30,000 elite soldiers in Chengdu, money and grain could support a year, and the military and the people all advocated death-fighting, Liu Zhang said: "Father and son have been in the state for more than twenty years, and there is no grace to add to the people. The people have been fighting for three years, and those who have been plastering the grass and the wilderness, with Zhang's reason, can he be at peace!" Then accompany Jian Yong Kaesong to surrender. When the city was opened, the people in the city shed tears. Liu Bei moved Liu Zhang to the public security, returned the property to him, and then pei Zhenwei sealed the letter.
Later, Sun Quan killed Guan Yu and obtained Jingzhou, with Liu Zhang as the pastor of Yizhou, stationed in Zigui, but soon fell ill and died.
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