Cai Mao character Deju, Xiangyang Caizhou people. At the end of the Eastern Han Dynasty, the jingzhou clan, the son of Cai Yi, the aunt (Cai Yi's sister) was the wife of the taiwei Zhang Wen, and the eldest sister and the second sister successively married Huang Chengyan and Liu Biao as the successors. In the first year of Chuping (190), Liu Biaodai Wang Rui was the assassin of Jingzhou, when the Jiangnan Emperor was prosperous, Cai Mao assisted Liu Biao in pacifying Jingzhou, and during the period of Serving Liu Biao, he successively served as the taishou of Jiangxia, NanJun, Zhangling and other counties, and Liu Biao served as his military division when he was awarded the title of General of Zhennan by the Han Dynasty. After Liu Biao's death, he supported Liu Chun's succession to the throne, and in 208 AD, when Cao Cao waved his army into Jingzhou, he and Ku Yue jointly forced Liu Chun to surrender to Cao Cao, and then shi shi entered Cao Cao's command, successively serving as a lieutenant of Zhonglang, Sima and Changshui, and was knighted as the Marquis of Hanyangting.

Cai Mao was born in Xiangyang County, Nan County, from the Cai clan of the Powerful Hao clan, his aunt was the wife of Zhang Wen, the Eastern Han Dynasty, the eldest sister and the second sister successively married Huang Chengyan and Liu Biao to become the stepmother, and Cai Mao befriended Cao Cao when she was a teenager.
In the first year of Chuping (190), Liu Biaodai Wang Rui was the assassin of Jingzhou, when the Jiangnan Emperor was prosperous, and Liu Biao was pingding Jiangnan, and he discussed the plan to pacify Jiangnan with Xiangyang Cai Mao and Nan Commandery Kuyue and Pu Liang.
During his service to Liu Biao, he successively served as the Taishou of Jiangxia, Nanjun, Zhangling and other counties. In the third year of Chuping (192 AD), Liu Biao was awarded the title of Zhennan General by the Han Dynasty, and cai Mao was later appointed by Liu Biao as the "Zhennan General Military Division".
At first, Liu Biaozhi took the appearance of his eldest son Liu Qizhi very similar to his own and was very fond of him, but later Liu Biao's second son Liu Qi married Lady Cai's niece, and Lady Cai therefore loved Liu Qi and hated Liu Qi, and often told Liu Biaojin to ruin Qi's reputation. Liu Biao spoiled his wife and received it every time he believed it. Cai Mao and Zhang Yun were also fortunate to be with Liu Biao and were also in harmony with Liu Yun.
Lady Cai intended to make Liu Chun his heir, while Cai Mao and Zhang Yun were his henchmen. Liu Qi fell out of favor due to Cai's slander, and eventually followed Zhuge Liang's strategy to request zhenjiangxia, Liu Qi, because of his brother's fall from favor and the influence of Cai, was very favored by his father, and also planned to let him take over Jingzhou. As a result, there was a feud between the brothers Liu Qi and Liu Chun. Liu Qi was not at ease, and at the suggestion of Zhuge Liang, he requested Liu Biao to be appointed as the Taishou of Jiangxia. In addition, the Shiyu ,Shiyu, a commentary in the Chronicle of the Three Kingdoms chronicles the Tales of the Ancestors, records that when Liu Bei was in Jingzhou, Cai Mao and Qu Yue attempted to murder Liu Bei while Liu Bei was entertaining Liu Bei, but in the end they were unsuccessful.
In the thirteenth year of Jian'an (208), Cao Cao led a large army to march south, Liu Biao was seriously ill, and Liu Qi returned from Jiangxia to Xiangyang to visit. Cai Mao and Zhang Yun were afraid that he would meet Liu Biao and touch the feelings of father and son, and Liu Biao might make Liu Qi his heir, so he said to Liu Qi: "The general has entrusted you to guard Jiangxia, and the responsibility is very heavy. Now that you've left your job, your father will be angry when he sees you. Hurting the feelings of relatives and increasing his illness is not the way of filial piety. They shut Liu Qi out of the door and forbade him to meet Liu Biao, and Liu Qi had to leave with tears in his eyes. After Liu Biao's death, Cai Mao, Zhang Yun, and others supported Liu Qi to succeed him as Jingzhou Pastor.
In September of the same year, Cao Cao arrived in Xinye, and Cai Mao and Qu Yue jointly forced Liu Qi to surrender to Cao Cao, and then shi entered Cao Cao's command, successively serving as Zhonglang, Sima and Changshui, and was knighted as the Marquis of Hanyang pavilion.
After Cao Cao captured Jingzhou, he went to Xiangyang, visited Cai Mao in person, entered his private room, and called out to his wife, saying that he and Cai Mao were old friends and had met Liang Mengxing. To see you again today is a blessing.
In the novel Romance of the Three Kingdoms, Cai Mao has long been involved with Liu Biao, and his sister is Liu Biao's wife, and it is Cai Mao who sees him personally. Sun Jian had a grudge with Liu Biao for hiding Yuxi, and Cai Mao was sent out of the army, but was defeated by Jian's general Huang Gai with an iron whip hitting the heart guard. Later, Liu Biaofu engaged Sun Jian, and the strategist Qu Liang persuaded Him to hold firm, but Cai Mao insisted on facing the battle, and the result was defeated by Sun Jian's general Cheng Pu. When Liu Bei was attached to Jingzhou, Cai Mao was deeply jealous of Liu Bei, and planned to assassinate Liu Bei at the banquet, and also made anti-poetry to blame Liu Bei, but none of them succeeded. After Liu Biao's death, Cai Mao established Liu Qi as his successor, and vigorously advised him to surrender to Cao, and killed Li Jue, who had entered the zhongyan. After the surrender of Cao Cao, because of the method of deep cultivation and training of water troops, he was named the governor of the water army of the Marquis of Zhennan, which was deeply taboo by Zhou Yu. So Zhou Yu set up a counter-plan, using Jiang Gan, who was going to Eastern Wu to spy on the military situation, to present Cao Cao with a report that Cai Mao and Zhang Yun plotted to rebel, and Cao Cao did not distinguish between their authenticity and falsehood for a while, so he summoned Cai Mao and Zhang Yun to come, and Cai Mao and Zhang Yun did not know their intentions, and cao Cao ordered the warriors to push them out and behead them. Later, Cao Cao learned of the plan, but it was too late. The mistaken killing of Cai Mao and Zhang Yun by Cao Cao was one of the reasons for Cao Cao's defeat at the Battle of Chibi, which left him without a general who was good at commanding the water army, and also reduced the loyalty of the Jingzhou army.