Introduction to the Cishu Building: The Cishu Building is located behind the Shi'en Hall. It is the place where the emperor's imperial edicts, imperial edicts, official titles, ancient documents and family archives are stored. It is a two-story building with three rooms on each floor. It is a typical Ming Dynasty building with front and rear exits. In the middle of the upper floor, there was a horizontal plaque "Ci Shu Lou" in seal script written by Wu Qikuan in the Qing Dynasty.