The main building in the Summer Palace was a magnificent three-story theater building and some palaces. It turned out that the Summer Palace was the largest ancient palace theater complex in China, which was built in 1891 and took four years to build. The word "dehe" is from the "left biography": "gentleman listens to his heart, heart peace", meaning that a gentleman listens to good music, will be calm, thus reaching the meaning of moral highness.