Historical allusions of Xinzheng: from Zuo Zhuan. He was angry because his mother Jiang supported his brother Uncle Duan's rebellion. In a rage, he placed him in Yingcheng and vowed, "I will never see you again!" " Afterwards, I regretted it very much. When Uncle Ying Kao knew it, he tactfully put forward the method of "digging the ground and digging the spring, and then meeting each other". In the tunnel, Zhuang Gong and his mother Chiang Kai-shek finally met. This is the famous story of Zheng Zhuanggong's "Digging Mother" in history.