Chen Deng's biography is appended briefly after those of Lü Bu and Chen Gong in Records of Wei 7 (Biographies of Lü Bu, Zhang Miao and Zang Hong). His courtesy name was Yuanlong. According to the Biography of the First Sovereign, when Tao Qian, Governor of Xu Province, died and the Attendant Officer Mi Zhu led the people of the province to welcome the First Sovereign (Liu Bei), the First Sovereign did not dare to accept, whereupon Chen Deng of Xiapi said that the house of Han was now in decline and the realm overturned, so that the time to achieve merit was this very day, and asked him to take charge of the province's affairs. When the First Sovereign suggested giving it to Yuan Gonglu (Yuan Shu) at Shouchun, Chen Deng said that Gonglu was arrogant and willful and no lord to bring order out of chaos, and that he would gather 100,000 infantry and cavalry for His Excellency. Records, Wei 7 §30–31Records, Shu 2 §9–10
When Yuan Shu sought a marriage alliance with Lü Bu, Chen Deng's father Chen Gui, Chancellor of Pei, persuaded Lü Bu to break off the marriage. Chen Gui wished to send Chen Deng to Taizu (Cao Cao), but Lü Bu would not let him go. Just then an envoy arrived and appointed Lü Bu General of the Left, and Lü Bu, greatly pleased, allowed Chen Deng to go and had him present a memorial of thanks. Chen Deng met Taizu and advised him that Lü Bu was brave but without plans and took going and staying lightly, so he should be dealt with early. Records, Wei 7 §19–20
Taizu said that Lü Bu harbored the ambitions of a wolf cub and was truly hard to keep for long, and that no one but Chen Deng could have fathomed his true nature. He at once raised Chen Gui's salary to fully two thousand dan and made Chen Deng Administrator of Guangling. At parting, Taizu took Chen Deng's hand, said, 'The affairs of the east I entrust to you,' and had him secretly gather followers to act as an inside collaborator. Records, Wei 7 §21
Lü Bu had sought the governorship of Xu Province through Chen Deng, so when Chen Deng returned he flew into a rage, drew his halberd and hacked at the desk, saying that only Chen Deng and his father had risen to high positions and that he himself had been sold out. Without changing his expression, Chen Deng calmly explained that he had told Lord Cao that dealing with the general was like keeping a tiger, which must be fed its fill, but that Lord Cao had replied it was like keeping a hawk, which is useful when hungry but flies away when full. Only then did Lü Bu's anger subside. Records, Wei 7 §22–23
When Yuan Shu, enraged, joined forces with Han Xian and Yang Feng and sent his chief general Zhang Xun to attack Lü Bu, Lü Bu blamed Chen Gui. Chen Gui said that Han Xian, Yang Feng and Yuan Shu were a hastily assembled army, and that by his son Chen Deng's reckoning they were like chickens tied together that could not perch on the same roost, so they could be split apart. When Lü Bu persuaded Han Xian and Yang Feng according to this plan, Zhang Xun was badly defeated. Records, Wei 7 §24
According to the Biography of Chen Jiao, Chen Deng as Administrator of Guangling made Chen Jiao his Officer of Merit and had him find out his reputation in Xudu. When Chen Jiao returned and said that people called the Administrator arrogant and conceited, Chen Deng replied that he respected Chen Yuanfang (Chen Ji) and his brothers for their virtue, Hua Ziyu (Hua Xin) for his propriety, Zhao Yuanda for his discernment and righteousness, Kong Wenju (Kong Rong) for his learning, and Liu Xuande (Liu Bei) for his strategy of a true king or hegemon, so how could he be arrogant? Chen Jiao and Xu Xuan were both valued by Chen Deng and, together with Chen Deng, set their hearts on Taizu. Records, Wei 22 §58 · 68
When Guangling Commandery was besieged by Sun Quan at Kuangqi, Chen Deng sent Chen Jiao to ask Taizu for relief, and Taizu sent troops. When the Wu troops withdrew, Chen Deng set ambushes in many places, led his troops in pursuit and crushed them. Chen Deng won an awe-inspiring name in Guangling and was given the added title of General Who Calms the Waves for his merit in pinning down Lü Bu from front and rear. Records, Wei 22 §59–60Records, Wei 7 §31
According to the Biography of Hua Tuo, Chen Deng, the Administrator of Guangling, suffered from an illness in which his chest felt oppressed, his face turned red and he could not eat. Hua Tuo said that worms had formed in his stomach from eating raw food, gave him a decoction and made him vomit about three sheng of worms, and said that the illness would flare up after three years and that he could be saved only if he met a good physician. When the time came the illness did flare up, and as Hua Tuo was not at hand, Chen Deng died just as he had said. He was thirty-nine years old. Records, Wei 29 §17Records, Wei 7 §31
Later, when Xu Si was seated with Liu Bei at the side of Liu Biao, Governor of Jing Province, Xu Si said that Chen Yuanlong was a man of the lakes and seas who had never shed his unrestrained spirit; when he had visited him at Xiapi, Chen Deng had lain on the big bed himself and made his guest lie on the lower bed. Liu Bei said that Yuanlong had shunned Xu Si because at a time when one should worry about the state he had sought only fields and houses, and that if it had been himself, he would have lain atop a hundred-chi tower and made Xu Si lie on the ground. When Liu Biao laughed heartily, Liu Bei said that a man of Yuanlong's civil and military talent, courage and resolve could be found only among the ancients. Records, Wei 7 §31–33
In his assessment, Chen Shou lamented that Chen Deng and Zang Hong both had heroic spirit and firm integrity, but that Chen Deng's allotted span was short and he passed away early without completing his achievements. Records, Wei 7 §62