Fan Duo was a fellow villager of Han Gaozu Liu Bang in Pei County, accompanied by Han Gaozu Liu Bang in Pei County, and later with Han Gao Zu Liu Bang into Guanzhong to destroy Qin, at the Hongmen Banquet, Fan Duo persuaded Han Gao Zu Liu Bang to flee immediately, during the Chu-Han War, he made many military achievements, and after the establishment of the Han Dynasty, he was awarded the title of Grand General, Zuo Cheng Xiang, and Marquis of Wuyang. Because he married Lü Hou's sister Lü Wei, he was also Lü Hou's brother-in-law.
Once, when the King of Yan, Lu Xuan, rebelled, Liu Bang, the ancestor of Han Gaozu, sent Fan Gaozu to lead an army against Lu Xie as Xiang Guo, and after Fan Duo left, someone said to Liu Bang of Han Gaozu that Fan Duo and Empress Lü colluded to wait for Han Gaozu Liu Bang to plot against him after a hundred years, liu Bang was originally dissatisfied with Empress Lü's interference in the government, and Fan Duo was Also Lü Hou's brother-in-law, and Han Gaozu Liu Bang wanted to replace Fan Duo's position to fight against Lu Xie and kill Fan Duo, so he asked Chen Ping and Zhou Bo to go to Fan Duo's military camp to declare that he wanted to kill Fan Duo directly in the army. Then let Zhou Bo replace Fan Duo to go on a crusade against Lu Xie.
Later, fan was captured, but Chen Ping discussed with Zhou Bo not to kill Fan Duo first, because Chen Ping knew that Fan Duo was Liu Bang's old subordinate, and he was afraid that after killing Fan Duo, Han Gaozu Liu Bang would regret it, and Fan Duo was also Lü Hou's brother-in-law, and Chen Ping was also afraid that killing Fan Duo would be hated by Lü Hou, so Chen Ping took Fan Duo into a prison car and sent him to the capital Chang'an to let Liu Bang deal with Han Gaozu, and Zhou Bo also thought that it would be better to do so.
Chen Ping carried Fan Duo to Chang'an in this way, and halfway through, Chen Ping heard the news of the death of Liu Bang, the ancestor of Han Gaozu, and after returning to Chang'an, Lü Hou released Fan Duo and restored his title and title. Fan Duo was thus saved by Chen Ping, and Chen Ping also saved himself because he did not directly execute Fan Duo.