Chengqiangong is one of the east six palaces in living zone of Forbidden City of Beijing. In 1420, it was completed and originally named Yongninggong (Palace of Eternal Tranquility). In August, 1632, it was finalized to be Chengqiangong. In 1655 it was rebuilt and in 1832 it was also partially restored. In Ming Dynasty, this palace was lived by Concubines and in Qing Dynasty; it was still the residence of concubines.

Additionally, Chengqiangong was not only famous for the pear flowers, but also a very heart-broken love story surrounding in the palaces over the past hundreds of years. In the early time of Qing Dynasty, Concubine Dongefei loved deeply by Emperor Shunzhi lived here. Here, Dongefei lived happily with Emperor Shunzhi in this pear-flower-blooming palace. Their romantic love story was even adored and spread by many famous poets or scholars such as Wu Meicun, a patriotic poet who wrote a lot of poems connected with love and patriotism.

In ancient China, theatergoing is the major amusement. During the time of diversities of festivals such as Spring Festival, Spring Begins, Lantern Festival, Double-Seven Day, Dragon-Boat Day, Middle-Autumn Festival, Double-Nine Day, Winter Begins, Emperor’s Enthronement and the Birthday Ceremony of Emperor and Empress, the royal members were always appreciated opera show here. There are many places for opera performance in Forbidden City: such as the theater stage between Taijidian(Hall of Supreme Principle) and Changchungong(Palace of Eternal Spring), Shufangzhai Theater Stage and so on, while the large-scale Changyinge(Pavilion of Pleasant Sounds) was specially used for opera performance on some great occasions. Majority of the performances belonging to Immortal Play show the peace and prosperity of the society. In terms of the reference record, during the reign of Empress Dowager Cixi, she used to appreciate the opera performance on some festive days with Emperor, Empress, Concubines as well as Prince and officials. In 1884, on the fiftieth birthday of Empress Dowager Cixi, in order to meet the need of Empress Dowager Cixi’s appreciation of opera performance, the consumption for costume and prop purchase is very big.

Pavilion of Pleasant Sounds(Changyinge)was in royal theater stage, and its full name is Grand Theater Stage of Changyinge(Pavilion of Pleasant Sounds) (Pavilion of Pleasant Sounds) in Ningshougong(Palace of Tranquil Longevity) of Forbidden City. It is located at the east side of Yangxindian(Hall of Mental Cultivation). In 1772 it was established and finished in 1776. In 1802 and 1891, it was reconstructed for two times. Changyinge(Pavilion of Pleasant Sounds) was the largest theater stage in Forbidden City. Equally famous with Grand Theater Stage of Deheyuan in Summer Palace, which was built in accordance with Changyinge(Pavilion of Pleasant Sounds), as well as Grand Theater Stage of Qingyinge in Summer Resort of Chengde.