Zhu Zhiwu retreated from the Qin's army, as the most important chapter in Zuo Zhuan, traditionally, the words of Zhu Zhiwu persuading Qin Bo were praised by the scholars. Only zheng was besieged by Jin and QIn, Zheng's crisis was resolved by Zhu Zhiwu who went and persuaded Qin Bo at night. However, Qin attacked Zheng bypassing Jin two years later far away by taking soldiers left in Zheng as hidden traitors. After Zhu Zhiwu persuading Qin Bo, the real withdrawal state was Jin while Qin desired to occupy Zheng in the name of withdrawal. This article believes if the withdrawal of Qin's army is not involved with Zhu Zhiwu, namely, rather than just confining to diplomatic words, how can Duke Mu of Qin be able to withdraw easily?And what is the real reason for Qin making friends with Jin then becoming enemies?