Just located at the north of the main gate, the main hall is the first hall of the Viceroy's Palace. It was rebuilt in 1870 on the original site of the Supreme Hall of the Glorious Light, the most luxurious hall of the Heavenly King's Palace during the period of Taiping Heavenly Kingdom. It was the place where the viceroy or the Heavenly King held the ceremonies. In January 1912, the inauguration ceremony of the Provisional President was held in the "Warm Pavilion" just on the northwest side of the main hall. From 1927, it was used for government functions by the Nationalist Government and the Office of the President.