"The Day I Was the Prime Minister of the Ming Dynasty" is a novel that combines elements of history, machinations and time travel. It tells the story of a modern young man who accidentally passed through Xu Jie, an important minister of the Jiajing Dynasty. In the critical situation of Yan Song's dictatorship, raging Japanese pirates and frequent border invasions, he turned the tide with his first aid. Relying on modern thinking and historical wisdom, the protagonist quietly changed the fate of the Ming Dynasty through the early dynasty games, cabinet maneuvers, and Xiyuan dialogues. The novel not only reproduces the tumultuous court struggles during the Jiajing-Longqing period, but also shows how reform can benefit the people through the fate of urban figures such as the Cao workers, the daughters of postmen, and the widows of border towns. Interweaving the warmth of family and the philosophy of time travellers, it finally settles on a profound proposition: the so-called history is just a day that countless people lived seriously. The full text takes one day as its axis and reflects the rise and fall of a thousand years.