On the fourth day of November of the eighteenth year of Yongle reign of the Ming Dynasty, the emperor issued an imperial edict announcing the completion of Beijing’s construction. That day is regarded as the birthday of the Beijing City and the Beijing imperial palace of the Ming Dynasty, which according to the Gregorian calendar, is December 8, 1420. Up to 2020, a full 600 years has passed by. Over the long years, the Ming capital and its core imperial palace buildings were taken by the Qing dynasty rulers as their capital and their Forbidden City as a matter of course. To mark the 600-year-old great ancient building complex, Mr. Jin Hongkui, an ancient architect and former Deputy Director of the Palace Museum, wrote The Forbidden City, 600 Years On, to enable readers to learn about the long construction history from the construction of the city in Yuan and Ming dynasties to the completion of the imperial palace. This book is primer on the architecture of the Forbidden City written by a professional scholar, catering to popular interest.