Introduction to Duixiu Mountain: Duixiu Mountain, also known as Duixiu Mountain in the Ming Dynasty, is located in the northeast of the Imperial Garden. This was originally the site of the Guanhua Hall in the Ming Dynasty. In the 11th year of Wanli (1583), it was rebuilt into a mountain. The mountain is adjacent to the palace wall in the north and is about 10 meters high. There is a cave on the front. Inside is a brick dome-style stone-carved dragon caisson. The cave door is inscribed "Duixiu" in Chinese on the forehead. There are stone dragon fountains on both sides of the mountain. There are dark places on the mountainside. A water tank is set up to store water, connected by pipes, and the water is directed to the mouth of the panlong to be sprayed out. This is the only remaining water method in the palace. There are climbing paths on the east and west sides of the mountain. You can reach the Royal View Pavilion on the top of the mountain by climbing up the stairs.